From e50f4fbbca21b85648f6c4045cbd50f672d315cd Mon Sep 17 00:00:00 2001 From: Peter Stone Date: Fri, 16 Oct 2026 21:04:38 +0000 Subject: Render an article's maths instead of showing its TeX source Reported against lcamtuf's Substack ("we should render tex", blog.coredump.cx/p/yours-truly): reader mode showed raw "\(p = \text{...}\)" where equations should be. What the page actually ships is the TeX SOURCE, as text, inside a "latex-rendered" div -- Substack renders it in the browser with its own script, which never runs here. Readability keeps that text verbatim (it strips the class, not the text), so nothing was being discarded during extraction and no amount of extraction-side repair would have helped: there was simply never any rendered markup to keep. So render it during extraction, where JavaScript is already running for Readability's sake. KaTeX (vendored in assets, never fetched -- this runs against untrusted third-party pages) converts each expression to MathML before Readability sees the document, and the reader WebView renders that natively. The reader keeps JavaScript OFF, as it must, and needs no stylesheet, webfont or script of KaTeX's; the only reader-side change is containing a wide equation so it scrolls within its own box instead of dragging the whole article sideways. Two details worth knowing: - KaTeX refuses {align} outside display mode, and Substack wraps display maths in INLINE delimiters (a block-styled span does the centring), so a mode that renders nothing is retried in the other one. An expression neither mode can render is left as source -- no worse than before. - The reported article came with "extractedContent cached: true", so the raw source was already on disk and every open read it back. Recognised and dropped on read (same mechanism as the cached consent notice), which re-extracts the article the next time it is opened. APK grows by ~90KB: the vendored katex.min.js (267KB) compresses to 91KB in the APK. No new permissions, no schema change, no new JS-enabled surface. Verified on the emulator against the live article: stale raw-TeX cache discarded, article re-extracted, all four equations rendered, and a wide align block scrolls inside itself. --- .coverage-baseline | 2 +- .../readability/ReaderExtractorMathTest.kt | 159 +++++++++++++++++++ app/src/main/assets/katex.min.js | 12 ++ .../org/terst/feedreader/data/CachedExtraction.kt | 38 ++++- .../feedreader/readability/ReaderExtractor.kt | 170 +++++++++++++++++++++ .../terst/feedreader/readability/UnrenderedTex.kt | 84 ++++++++++ .../java/org/terst/feedreader/ui/ReaderScreen.kt | 5 +- .../java/org/terst/feedreader/ui/ReaderWebView.kt | 7 + .../terst/feedreader/data/CachedExtractionTest.kt | 32 ++++ .../feedreader/readability/UnrenderedTexTest.kt | 116 ++++++++++++++ .../java/org/terst/feedreader/ui/ReaderMathTest.kt | 46 ++++++ 11 files changed, 661 insertions(+), 10 deletions(-) create mode 100644 app/src/androidTest/java/org/terst/feedreader/readability/ReaderExtractorMathTest.kt create mode 100644 app/src/main/assets/katex.min.js create mode 100644 app/src/main/java/org/terst/feedreader/readability/UnrenderedTex.kt create mode 100644 app/src/test/java/org/terst/feedreader/readability/UnrenderedTexTest.kt create mode 100644 app/src/test/java/org/terst/feedreader/ui/ReaderMathTest.kt diff --git a/.coverage-baseline b/.coverage-baseline index 36e5a8a..c6d8499 100644 --- a/.coverage-baseline +++ b/.coverage-baseline @@ -1 +1 @@ -15.17 +17.89 diff --git a/app/src/androidTest/java/org/terst/feedreader/readability/ReaderExtractorMathTest.kt b/app/src/androidTest/java/org/terst/feedreader/readability/ReaderExtractorMathTest.kt new file mode 100644 index 0000000..67b3bf1 --- /dev/null +++ b/app/src/androidTest/java/org/terst/feedreader/readability/ReaderExtractorMathTest.kt @@ -0,0 +1,159 @@ +package org.terst.feedreader.readability + +import androidx.test.ext.junit.runners.AndroidJUnit4 +import androidx.test.platform.app.InstrumentationRegistry +import kotlinx.coroutines.runBlocking +import okhttp3.mockwebserver.MockResponse +import okhttp3.mockwebserver.MockWebServer +import org.junit.After +import org.junit.Assert.assertFalse +import org.junit.Assert.assertNotNull +import org.junit.Assert.assertTrue +import org.junit.Before +import org.junit.Test +import org.junit.runner.RunWith + +/** + * Maths rendering during extraction ("we should render tex", reported against lcamtuf's + * Substack). + * + * What the live page actually ships -- confirmed by fetching + * https://blog.coredump.cx/p/yours-truly -- is TeX SOURCE, in a text node, inside a + * `
` wrapper: Substack renders + * it client-side with its own script, which never runs in this app. Readability keeps that + * text verbatim (it strips the class but not the text), so the reader showed the source. + * + * So extraction renders it: KaTeX (vendored in assets, never fetched) converts each + * expression to MathML before Readability runs, and the reader WebView -- still with + * JavaScript off -- renders the MathML natively. + * + * Needs a real WebView, so this is instrumented. Fixtures reproduce the exact markup shape + * from the live page rather than being a scraped copy of it (see ReaderExtractorFixtureTest + * for why). + */ +@RunWith(AndroidJUnit4::class) +class ReaderExtractorMathTest { + + private lateinit var server: MockWebServer + + @Before + fun startServer() { + server = MockWebServer() + server.start() + } + + @After + fun stopServer() { + server.shutdown() + } + + private fun extract(html: String): ExtractedArticle? { + server.enqueue(MockResponse().setBody(html).setResponseCode(200)) + val url = server.url("/article").toString() + val context = InstrumentationRegistry.getInstrumentation().targetContext + return runBlocking { ReaderExtractor.extract(context, url) } + } + + private val filler = + "Considered as a whole, an if-then statement cannot be true when its antecedent holds " + + "and its consequent does not, which is the whole of the trick being played here. " + + // Substack's shape, verbatim from the live page: inline \( \) delimiters in a text node, + // inside a block-styled span inside the latex-rendered wrapper. Note the align block is + // ALSO wrapped in inline delimiters -- KaTeX refuses {align} outside display mode, so + // rendering has to fall back to display mode rather than give up. + private val substackFixture = """ + Yours truly + +
+

Yours truly

+

Imagine the following seemingly innocent sentence:

+
+
\(p = \text{“if }p\text{ is true, then pigs can fly”}\)
+
+

$filler

+

A slice of the set may look the following way:

+
+
\(\begin{align} +t_{1012} &= \text{“Cindy weighs 12 pounds.”} \\ +t_{1013} &= \text{“Cindy doesn't weigh 13 pounds.”} +\end{align}\)
+
+

$filler

+
+ + """.trimIndent() + + // The other two conventional delimiter styles, and the one place maths must NOT be + // rendered: an article quoting TeX source on purpose, inside 
.
+    private val delimiterFixture = """
+        Delimiter styles
+        
+        

+        
Delimiter styles

+        
$filler

+        
The bracket form: \[ x_{1} + y^{2} \] and the dollar form: $$ a_{n} = b^{n} $$ in one paragraph.

+        
$filler

+        
To write that yourself, type:

+        
\(E = mc^{2}\)

+        
$filler

+        

+        
+    """.trimIndent()
+
+    @Test
+    fun substackTexSourceIsRenderedToMathMl() {
+        val result = extract(substackFixture)
+
+        assertNotNull("extraction should succeed", result)
+        val content = result?.content.orEmpty()
+        assertTrue("both expressions should be rendered as MathML, got:\n$content", content.split(" is the point of the sentence and must stay source, got:\n$content",
+            content.contains("E = mc^{2}")
+        )
+    }
+}
diff --git a/app/src/main/assets/katex.min.js b/app/src/main/assets/katex.min.js
new file mode 100644
index 0000000..bb80e5b
--- /dev/null
+++ b/app/src/main/assets/katex.min.js
@@ -0,0 +1,12 @@
+/*
+ * KaTeX v0.19.0 -- https://katex.org  (MIT License)
+ * Copyright (c) 2013-2020 Khan Academy and other contributors
+ *
+ * Vendored, never fetched: ReaderExtractor injects this into the page it is
+ * extracting, which is untrusted third-party content. Loading a renderer from a CDN
+ * there would be both a privacy leak (every article read, reported to a third party)
+ * and a remote-code injection surface.
+ *
+ * Unmodified copy of dist/katex.min.js from the npm package `katex@0.19.0`.
+ */
+!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?exports.katex=t():e.katex=t()}("undefined"!=typeof self?self:this,function(){return function(){"use strict";var e={d:function(t,r){for(var n in r)e.o(r,n)&&!e.o(t,n)&&Object.defineProperty(t,n,{enumerable:!0,get:r[n]})},o:function(e,t){return Object.prototype.hasOwnProperty.call(e,t)}},t={};e.d(t,{default:function(){return go}});class r extends Error{constructor(e,t){let n,o,s="KaTeX parse error: "+e;const i=t&&t.loc;if(i&&i.start<=i.end){const e=i.lexer.input;n=i.start,o=i.end,n===e.length?s+=" at end of input: ":s+=" at position "+(n+1)+": ";const t=e.slice(n,o).replace(/[^]/g,"$&\u0332");let r,a;r=n>15?"\u2026"+e.slice(n-15,n):e.slice(0,n),a=o+15e.replace(o,"-$1").toLowerCase(),i={"&":"&",">":">","<":"<",'"':""","'":"'"},a=/[&><"']/g,l=e=>String(e).replace(a,e=>i[e]),c=e=>"ordgroup"===e.type||"color"===e.type?1===e.body.length?c(e.body[0]):e:"font"===e.type?c(e.body):e,h=new Set(["mathord","textord","atom"]),m=e=>h.has(c(e).type),u={displayMode:{type:"boolean",description:"Render math in display mode, which puts the math in display style (so \\int and \\sum are large, for example), and centers the math on the page on its own line.",cli:"-d, --display-mode"},output:{type:{enum:["htmlAndMathml","html","mathml"]},description:"Determines the markup language of the output.",cli:"-F, --format "},leqno:{type:"boolean",description:"Render display math in leqno style (left-justified tags)."},fleqn:{type:"boolean",description:"Render display math flush left."},throwOnError:{type:"boolean",default:!0,cli:"-t, --no-throw-on-error",cliDescription:"Render errors (in the color given by --error-color) instead of throwing a ParseError exception when encountering an error."},errorColor:{type:"string",default:"#cc0000",cli:"-c, --error-color ",cliDescription:"A color string given in the format 'rgb' or 'rrggbb' (no #). This option determines the color of errors rendered by the -t option.",cliProcessor:e=>"#"+e},macros:{type:"object",cli:"-m, --macro ",cliDescription:"Define custom macro of the form '\\foo:expansion' (use multiple -m arguments for multiple macros).",cliDefault:[],cliProcessor:(e,t)=>(t.push(e),t)},minRuleThickness:{type:"number",description:"Specifies a minimum thickness, in ems, for fraction lines, `\\sqrt` top lines, `{array}` vertical lines, `\\hline`, `\\hdashline`, `\\underline`, `\\overline`, and the borders of `\\fbox`, `\\boxed`, and `\\fcolorbox`.",processor:e=>Math.max(0,e),cli:"--min-rule-thickness ",cliProcessor:parseFloat},colorIsTextColor:{type:"boolean",description:"Makes \\color behave like LaTeX's 2-argument \\textcolor, instead of LaTeX's one-argument \\color mode change.",cli:"-b, --color-is-text-color"},strict:{type:[{enum:["warn","ignore","error"]},"boolean","function"],description:"Turn on strict / LaTeX faithfulness mode, which throws an error if the input uses features that are not supported by LaTeX.",cli:"-S, --strict",cliDefault:!1},trust:{type:["boolean","function"],description:"Trust the input, enabling all HTML features such as \\url.",cli:"-T, --trust"},maxSize:{type:"number",default:1/0,description:"If non-zero, all user-specified sizes, e.g. in \\rule{500em}{500em}, will be capped to maxSize ems. Otherwise, elements and spaces can be arbitrarily large",processor:e=>Math.max(0,e),cli:"-s, --max-size ",cliProcessor:parseInt},maxExpand:{type:"number",default:1e3,description:"Limit the number of macro expansions to the specified number, to prevent e.g. infinite macro loops. If set to Infinity, the macro expander will try to fully expand as in LaTeX.",processor:e=>Math.max(0,e),cli:"-e, --max-expand ",cliProcessor:e=>"Infinity"===e?1/0:parseInt(e)},globalGroup:{type:"boolean",cli:!1}};function p(e){if(Object.prototype.hasOwnProperty.call(e,"default")&&void 0!==e.default)return e.default;return function(e){if("string"!=typeof e)return e.enum[0];switch(e){case"boolean":return!1;case"string":return"";case"number":return 0;case"object":return{};default:throw new Error("Unexpected schema type; settings must declare an explicit default.")}}(Array.isArray(e.type)?e.type[0]:e.type)}function d(e,t,r,n){const o=Object.prototype.hasOwnProperty.call(r,t)?r[t]:void 0,s=Object.prototype.hasOwnProperty.call(n,"processor")?n.processor:void 0;e[t]=void 0!==o?s?s(o):o:p(n)}class g{constructor(e){void 0===e&&(e={}),this.displayMode=void 0,this.output=void 0,this.leqno=void 0,this.fleqn=void 0,this.throwOnError=void 0,this.errorColor=void 0,this.macros=void 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so=/^[\u208a\u208b\u208c\u208d\u208e\u2080\u2081\u2082\u2083\u2084\u2085\u2086\u2087\u2088\u2089\u2090\u2091\u2095\u1d62\u2c7c\u2096\u2097\u2098\u2099\u2092\u209a\u1d63\u209b\u209c\u1d64\u1d65\u2093\u1d66\u1d67\u1d68\u1d69\u1d6a]/,io=Object.freeze({"\u208a":"+","\u208b":"-","\u208c":"=","\u208d":"(","\u208e":")","\u2080":"0","\u2081":"1","\u2082":"2","\u2083":"3","\u2084":"4","\u2085":"5","\u2086":"6","\u2087":"7","\u2088":"8","\u2089":"9","\u2090":"a","\u2091":"e","\u2095":"h","\u1d62":"i","\u2c7c":"j","\u2096":"k","\u2097":"l","\u2098":"m","\u2099":"n","\u2092":"o","\u209a":"p","\u1d63":"r","\u209b":"s","\u209c":"t","\u1d64":"u","\u1d65":"v","\u2093":"x","\u1d66":"\u03b2","\u1d67":"\u03b3","\u1d68":"\u03c1","\u1d69":"\u03d5","\u1d6a":"\u03c7","\u207a":"+","\u207b":"-","\u207c":"=","\u207d":"(","\u207e":")","\u2070":"0","\xb9":"1","\xb2":"2","\xb3":"3","\u2074":"4","\u2075":"5","\u2076":"6","\u2077":"7","\u2078":"8","\u2079":"9","\u1d2c":"A","\u1d2e":"B","\u1d30":"D","\u1d31":"E","\u1d33":"G","\u1d34":"H","\u1d35":"I","\u1d36":"J","\u1d37":"K","\u1d38":"L","\u1d39":"M","\u1d3a":"N","\u1d3c":"O","\u1d3e":"P","\u1d3f":"R","\u1d40":"T","\u1d41":"U","\u2c7d":"V","\u1d42":"W","\u1d43":"a","\u1d47":"b","\u1d9c":"c","\u1d48":"d","\u1d49":"e","\u1da0":"f","\u1d4d":"g","\u02b0":"h","\u2071":"i","\u02b2":"j","\u1d4f":"k","\u02e1":"l","\u1d50":"m","\u207f":"n","\u1d52":"o","\u1d56":"p","\u02b3":"r","\u02e2":"s","\u1d57":"t","\u1d58":"u","\u1d5b":"v","\u02b7":"w","\u02e3":"x","\u02b8":"y","\u1dbb":"z","\u1d5d":"\u03b2","\u1d5e":"\u03b3","\u1d5f":"\u03b4","\u1d60":"\u03d5","\u1d61":"\u03c7","\u1dbf":"\u03b8"}),ao={"\u0301":{text:"\\'",math:"\\acute"},"\u0300":{text:"\\`",math:"\\grave"},"\u0308":{text:'\\"',math:"\\ddot"},"\u0303":{text:"\\~",math:"\\tilde"},"\u0304":{text:"\\=",math:"\\bar"},"\u0306":{text:"\\u",math:"\\breve"},"\u030c":{text:"\\v",math:"\\check"},"\u0302":{text:"\\^",math:"\\hat"},"\u0307":{text:"\\.",math:"\\dot"},"\u030a":{text:"\\r",math:"\\mathring"},"\u030b":{text:"\\H"},"\u0327":{text:"\\c"}},lo={"\xe1":"a\u0301","\xe0":"a\u0300","\xe4":"a\u0308","\u01df":"a\u0308\u0304","\xe3":"a\u0303","\u0101":"a\u0304","\u0103":"a\u0306","\u1eaf":"a\u0306\u0301","\u1eb1":"a\u0306\u0300","\u1eb5":"a\u0306\u0303","\u01ce":"a\u030c","\xe2":"a\u0302","\u1ea5":"a\u0302\u0301","\u1ea7":"a\u0302\u0300","\u1eab":"a\u0302\u0303","\u0227":"a\u0307","\u01e1":"a\u0307\u0304","\xe5":"a\u030a","\u01fb":"a\u030a\u0301","\u1e03":"b\u0307","\u0107":"c\u0301","\u1e09":"c\u0327\u0301","\u010d":"c\u030c","\u0109":"c\u0302","\u010b":"c\u0307","\xe7":"c\u0327","\u010f":"d\u030c","\u1e0b":"d\u0307","\u1e11":"d\u0327","\xe9":"e\u0301","\xe8":"e\u0300","\xeb":"e\u0308","\u1ebd":"e\u0303","\u0113":"e\u0304","\u1e17":"e\u0304\u0301","\u1e15":"e\u0304\u0300","\u0115":"e\u0306","\u1e1d":"e\u0327\u0306","\u011b":"e\u030c","\xea":"e\u0302","\u1ebf":"e\u0302\u0301","\u1ec1":"e\u0302\u0300","\u1ec5":"e\u0302\u0303","\u0117":"e\u0307","\u0229":"e\u0327","\u1e1f":"f\u0307","\u01f5":"g\u0301","\u1e21":"g\u0304","\u011f":"g\u0306","\u01e7":"g\u030c","\u011d":"g\u0302","\u0121":"g\u0307","\u0123":"g\u0327","\u1e27":"h\u0308","\u021f":"h\u030c","\u0125":"h\u0302","\u1e23":"h\u0307","\u1e29":"h\u0327","\xed":"i\u0301","\xec":"i\u0300","\xef":"i\u0308","\u1e2f":"i\u0308\u0301","\u0129":"i\u0303","\u012b":"i\u0304","\u012d":"i\u0306","\u01d0":"i\u030c","\xee":"i\u0302","\u01f0":"j\u030c","\u0135":"j\u0302","\u1e31":"k\u0301","\u01e9":"k\u030c","\u0137":"k\u0327","\u013a":"l\u0301","\u013e":"l\u030c","\u013c":"l\u0327","\u1e3f":"m\u0301","\u1e41":"m\u0307","\u0144":"n\u0301","\u01f9":"n\u0300","\xf1":"n\u0303","\u0148":"n\u030c","\u1e45":"n\u0307","\u0146":"n\u0327","\xf3":"o\u0301","\xf2":"o\u0300","\xf6":"o\u0308","\u022b":"o\u0308\u0304","\xf5":"o\u0303","\u1e4d":"o\u0303\u0301","\u1e4f":"o\u0303\u0308","\u022d":"o\u0303\u0304","\u014d":"o\u0304","\u1e53":"o\u0304\u0301","\u1e51":"o\u0304\u0300","\u014f":"o\u0306","\u01d2":"o\u030c","\xf4":"o\u0302","\u1ed1":"o\u0302\u0301","\u1ed3":"o\u0302\u0300","\u1ed7":"o\u0302\u0303","\u022f":"o\u0307","\u0231":"o\u0307\u0304","\u0151":"o\u030b","\u1e55":"p\u0301","\u1e57":"p\u0307","\u0155":"r\u0301","\u0159":"r\u030c","\u1e59":"r\u0307","\u0157":"r\u0327","\u015b":"s\u0301","\u1e65":"s\u0301\u0307","\u0161":"s\u030c","\u1e67":"s\u030c\u0307","\u015d":"s\u0302","\u1e61":"s\u0307","\u015f":"s\u0327","\u1e97":"t\u0308","\u0165":"t\u030c","\u1e6b":"t\u0307","\u0163":"t\u0327","\xfa":"u\u0301","\xf9":"u\u0300","\xfc":"u\u0308","\u01d8":"u\u0308\u0301","\u01dc":"u\u0308\u0300","\u01d6":"u\u0308\u0304","\u01da":"u\u0308\u030c","\u0169":"u\u0303","\u1e79":"u\u0303\u0301","\u016b":"u\u0304","\u1e7b":"u\u0304\u0308","\u016d":"u\u0306","\u01d4":"u\u030c","\xfb":"u\u0302","\u016f":"u\u030a","\u0171":"u\u030b","\u1e7d":"v\u0303","\u1e83":"w\u0301","\u1e81":"w\u0300","\u1e85":"w\u0308","\u0175":"w\u0302","\u1e87":"w\u0307","\u1e98":"w\u030a","\u1e8d":"x\u0308","\u1e8b":"x\u0307","\xfd":"y\u0301","\u1ef3":"y\u0300","\xf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co{constructor(e,t){this.mode=void 0,this.gullet=void 0,this.settings=void 0,this.leftrightDepth=void 0,this.nextToken=void 0,this.mode="math",this.gullet=new oo(e,t,this.mode),this.settings=t,this.leftrightDepth=0,this.nextToken=null}expect(e,t){if(void 0===t&&(t=!0),this.fetch().text!==e)throw new n("Expected '"+e+"', got '"+this.fetch().text+"'",this.fetch());t&&this.consume()}consume(){this.nextToken=null}fetch(){return null==this.nextToken&&(this.nextToken=this.gullet.expandNextToken()),this.nextToken}switchMode(e){this.mode=e,this.gullet.switchMode(e)}parse(){this.settings.globalGroup||this.gullet.beginGroup(),this.settings.colorIsTextColor&&this.gullet.macros.set("\\color","\\textcolor");try{const e=this.parseExpression(!1);return this.expect("EOF"),this.settings.globalGroup||this.gullet.endGroup(),e}finally{this.gullet.endGroups()}}subparse(e){const t=this.nextToken;this.consume(),this.gullet.pushToken(new rn("}")),this.gullet.pushTokens(e);const r=this.parseExpression(!1);return this.expect("}"),this.nextToken=t,r}parseExpression(e,t){const r=[];for(;;){"math"===this.mode&&this.consumeSpaces();const n=this.fetch();if(co.endOfExpression.has(n.text))break;if(t&&n.text===t)break;if(e&&Vn[n.text]&&Vn[n.text].infix)break;const o=this.parseAtom(t);if(!o)break;"internal"!==o.type&&r.push(o)}return"text"===this.mode&&this.formLigatures(r),this.handleInfixNodes(r)}handleInfixNodes(e){let t,r=-1;for(let o=0;o=128))return null;this.settings.strict&&(T(t.charCodeAt(0))?"math"===this.mode&&Fe({strict:this.settings.strict,errorCode:"unicodeTextInMathMode",errorMsg:'Unicode text character "'+t[0]+'" used in math mode',report:!0,token:e}):Fe({strict:this.settings.strict,errorCode:"unknownSymbol",errorMsg:'Unrecognized Unicode character "'+t[0]+'" ('+t.charCodeAt(0)+")",report:!0,token:e})),o={type:"textord",mode:"text",loc:tn.range(e),text:t}}var s;if(this.consume(),r)for(let t=0;t Unit
 ): CachedExtraction {
-    if (!ConsentNotice.looksLikeConsentNotice(cached)) {
-        return CachedExtraction(content = cached, discardedConsentNotice = false)
-    }
+    val discard = when {
+        ConsentNotice.looksLikeConsentNotice(cached) ->
+            CachedExtraction(content = null, discardedConsentNotice = true)
+        // Same shape of problem, different cause: this one was extracted before extraction
+        // rendered maths, so it holds the TeX source the page shipped.
+        UnrenderedTex.looksLikeUnrenderedTex(cached) ->
+            CachedExtraction(
+                content = null,
+                discardedConsentNotice = false,
+                discardedUnrenderedTex = true
+            )
+        else -> null
+    } ?: return CachedExtraction(content = cached, discardedConsentNotice = false)
+
     clearCache()
-    return CachedExtraction(content = null, discardedConsentNotice = true)
+    return discard
 }
diff --git a/app/src/main/java/org/terst/feedreader/readability/ReaderExtractor.kt b/app/src/main/java/org/terst/feedreader/readability/ReaderExtractor.kt
index 21633b4..4858007 100644
--- a/app/src/main/java/org/terst/feedreader/readability/ReaderExtractor.kt
+++ b/app/src/main/java/org/terst/feedreader/readability/ReaderExtractor.kt
@@ -80,6 +80,14 @@ object ReaderExtractor {
         cachedReadabilityJs ?: context.assets.open("Readability.js").bufferedReader().use { it.readText() }
             .also { cachedReadabilityJs = it }
 
+    // KaTeX (~267KB vendored, see assets/katex.min.js), cached for the same reason and
+    // under the same single-threaded guarantee as Readability.js above.
+    private var cachedKatexJs: String? = null
+
+    private fun loadKatexJs(context: Context): String =
+        cachedKatexJs ?: context.assets.open("katex.min.js").bufferedReader().use { it.readText() }
+            .also { cachedKatexJs = it }
+
     /**
      * Extracts article content, or explains why it could not.
      *
@@ -138,6 +146,7 @@ object ReaderExtractor {
             webView.webViewClient = object : WebViewClient() {
                 override fun onPageFinished(view: WebView, finishedUrl: String) {
                     val readabilityJs = loadReadabilityJs(context)
+                    val katexJs = loadKatexJs(context)
                     val script = """
                         (function() {
                             try {
@@ -384,6 +393,167 @@ object ReaderExtractor {
                                     if (sequels[i].parentNode) sequels[i].parentNode.removeChild(sequels[i]);
                                 }
 
+                                // A page that uses TeX ships the SOURCE of its maths and
+                                // renders it in the browser with its own script -- which
+                                // never runs here, so the source is all there is. Confirmed
+                                // live on lcamtuf's Substack (blog.coredump.cx/p/yours-truly):
+                                // all four of that article's equations arrive as literal
+                                // "\(p = \text{...}\)" text in a span inside a
+                                // "latex-rendered" div, and Readability keeps that text
+                                // verbatim (it strips the class, not the text) -- which is
+                                // exactly what the reader was showing. So render it HERE,
+                                // where JS is already running for Readability's sake, and
+                                // hand the reader finished markup.
+                                //
+                                // Output is MathML, not KaTeX's usual HTML: the WebView
+                                // renders MathML natively, so nothing downstream needs
+                                // KaTeX's stylesheet, its webfonts, or any script -- the
+                                // reader WebView keeps JavaScript OFF, as it must for
+                                // untrusted article content. KaTeX's HTML output would not
+                                // have survived anyway: it is entirely class-driven, and
+                                // Readability strips class attributes.
+                                var katex = (function() {
+                                    // Hand KaTeX's UMD wrapper a CommonJS target of our own.
+                                    // Left to itself it would take the AMD branch on any page
+                                    // that happens to ship an AMD loader (leaving `katex`
+                                    // undefined), or publish itself on the page's window --
+                                    // and this is a tool we are using on the document, not
+                                    // something the document should see or be able to redefine.
+                                    var module = { exports: {} };
+                                    var exports = module.exports;
+                                    var define = undefined;
+                                    $katexJs
+                                    return module.exports;
+                                })();
+
+                                (function renderTexSource() {
+                                    if (!katex || typeof katex.renderToString !== 'function') return;
+                                    // Delimiter pairs, scanned left to right. Single-$ inline
+                                    // maths is deliberately NOT supported: prices and currency
+                                    // in ordinary prose would be mangled far more often than
+                                    // real maths would be found.
+                                    var DELIMITERS = [
+                                        { left: '$$', right: '$$', display: true },
+                                        { left: '\\[', right: '\\]', display: true },
+                                        { left: '\\(', right: '\\)', display: false }
+                                    ];
+                                    // Where TeX-looking text is quoted on purpose rather than
+                                    // meant as maths -- an article ABOUT TeX shows its source.
+                                    var SKIP_TAGS = {
+                                        SCRIPT: 1, STYLE: 1, PRE: 1, CODE: 1, KBD: 1,
+                                        SAMP: 1, TEXTAREA: 1, NOSCRIPT: 1, MATH: 1
+                                    };
+                                    // A page is untrusted content: cap the work it can ask for.
+                                    // Far above any real article (the reported one has four).
+                                    var MAX_EXPRESSIONS = 300;
+                                    var rendered = 0;
+
+                                    function renderOnce(tex, display) {
+                                        var holder = document.createElement('div');
+                                        try {
+                                            holder.innerHTML = katex.renderToString(tex, {
+                                                output: 'mathml',
+                                                displayMode: display,
+                                                throwOnError: false,
+                                                strict: false
+                                            });
+                                        } catch (e) {
+                                            return null;
+                                        }
+                                        var math = holder.querySelector('math');
+                                        if (!math) return null;
+                                        // KaTeX attaches an  holding the TeX source
+                                        // again, for copy/paste tools. Nothing renders it, but it
+                                        // does count toward Readability's text-length scoring --
+                                        // and it is the source we just replaced, so drop it.
+                                        var annotations = math.querySelectorAll('annotation');
+                                        for (var a = 0; a < annotations.length; a++) {
+                                            annotations[a].parentNode.removeChild(annotations[a]);
+                                        }
+                                        return math;
+                                    }
+
+                                    function renderTex(tex, display) {
+                                        // KaTeX refuses {align} and friends outside display mode
+                                        // (with throwOnError off it returns an error span and no
+                                        //  at all) -- and Substack wraps DISPLAY maths in
+                                        // INLINE delimiters, leaving the centring to a
+                                        // block-styled span. Confirmed live: both of the reported
+                                        // article's multi-line align blocks are \( ... \). So a
+                                        // mode that produces nothing is retried in the other one,
+                                        // and only if both come up empty is the source left
+                                        // exactly as it was -- no worse than before.
+                                        return renderOnce(tex, display) || renderOnce(tex, !display);
+                                    }
+
+                                    function nextDelimiter(text, from) {
+                                        var best = null;
+                                        for (var d = 0; d < DELIMITERS.length; d++) {
+                                            var at = text.indexOf(DELIMITERS[d].left, from);
+                                            if (at === -1) continue;
+                                            if (!best || at < best.at) best = { at: at, delimiter: DELIMITERS[d] };
+                                        }
+                                        return best;
+                                    }
+
+                                    function isSkipped(node) {
+                                        for (var p = node.parentNode; p && p.nodeType === 1; p = p.parentNode) {
+                                            if (SKIP_TAGS[p.tagName]) return true;
+                                        }
+                                        return false;
+                                    }
+
+                                    // Collect first, rewrite after: replacing a text node while
+                                    // the walker is still pointing into it invalidates the walk.
+                                    var walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT, null, false);
+                                    var candidates = [];
+                                    var node;
+                                    while ((node = walker.nextNode())) {
+                                        var data = node.nodeValue || '';
+                                        if (data.indexOf('\\(') === -1 && data.indexOf('\\[') === -1 &&
+                                            data.indexOf('$$') === -1) continue;
+                                        if (isSkipped(node)) continue;
+                                        candidates.push(node);
+                                    }
+
+                                    for (var c = 0; c < candidates.length; c++) {
+                                        var target = candidates[c];
+                                        var text = target.nodeValue || '';
+                                        var fragment = document.createDocumentFragment();
+                                        var cursor = 0;
+                                        var replacedAny = false;
+                                        while (cursor < text.length && rendered < MAX_EXPRESSIONS) {
+                                            var found = nextDelimiter(text, cursor);
+                                            if (!found) break;
+                                            var innerStart = found.at + found.delimiter.left.length;
+                                            var closeAt = text.indexOf(found.delimiter.right, innerStart);
+                                            // An unpaired delimiter is just prose that happens to
+                                            // contain one. Leave the rest of the node alone.
+                                            if (closeAt === -1) break;
+                                            var tex = text.slice(innerStart, closeAt);
+                                            var math = tex.trim() ? renderTex(tex, found.delimiter.display) : null;
+                                            if (!math) {
+                                                // Not renderable: step past this opening delimiter
+                                                // and keep looking, rather than dropping the text.
+                                                cursor = innerStart;
+                                                continue;
+                                            }
+                                            if (found.at > cursor) {
+                                                fragment.appendChild(document.createTextNode(text.slice(cursor, found.at)));
+                                            }
+                                            fragment.appendChild(math);
+                                            cursor = closeAt + found.delimiter.right.length;
+                                            replacedAny = true;
+                                            rendered++;
+                                        }
+                                        if (!replacedAny) continue;
+                                        if (cursor < text.length) {
+                                            fragment.appendChild(document.createTextNode(text.slice(cursor)));
+                                        }
+                                        target.parentNode.replaceChild(fragment, target);
+                                    }
+                                })();
+
                                 // Readability's default hidden-element skip (treating display:none /
                                 // visibility:hidden nodes as boilerplate) is correct for the vast
                                 // majority of sites -- it's what keeps collapsed nav/footer/sidebar
diff --git a/app/src/main/java/org/terst/feedreader/readability/UnrenderedTex.kt b/app/src/main/java/org/terst/feedreader/readability/UnrenderedTex.kt
new file mode 100644
index 0000000..aa46f7e
--- /dev/null
+++ b/app/src/main/java/org/terst/feedreader/readability/UnrenderedTex.kt
@@ -0,0 +1,84 @@
+package org.terst.feedreader.readability
+
+/**
+ * Recognises a cached extraction that still holds raw TeX source instead of rendered maths.
+ *
+ * Needed for the same reason [ConsentNotice] is: fixing the extractor only changes what
+ * FUTURE extractions produce. The reported article ("we should render tex", lcamtuf's
+ * Substack) came with `extractedContent cached: true` -- its raw `\(p = \text{...}\)`
+ * source was already on disk, and every open read it straight back out, so the reader
+ * would have gone on showing TeX source no matter what the extractor learned to do.
+ * Recognising it on read re-extracts the article the next time it is opened, including
+ * everything extracted before maths rendering existed.
+ *
+ * Over-detecting is the real risk here, and it is a specific one: a false positive makes
+ * an article re-extract on EVERY open, for ever, because re-extracting cannot change a
+ * verdict the content itself causes. So the bar is a complete delimiter pair around
+ * something that actually looks like an expression, and never anything that already
+ * carries rendered MathML.
+ */
+object UnrenderedTex {
+
+    /**
+     * Length past which a delimiter pair is read as two unrelated delimiters rather than
+     * one expression. Generous: the reported article's longest block (a ten-line `align`
+     * environment) is well under half this.
+     */
+    private const val MAX_EXPRESSION_LENGTH = 2_000
+
+    /** Delimiter pairs, matching the ones extraction renders (see ReaderExtractor). */
+    private val DELIMITERS = listOf("\\(" to "\\)", "\\[" to "\\]", "$$" to "$$")
+
+    /**
+     * Characters no plain sentence between two stray delimiters is likely to contain but
+     * essentially every real expression does -- a command, a group, a sub- or superscript.
+     */
+    private const val TEX_MARKERS = "\\{_^"
+
+    /**
+     * Quoted source, not maths: extraction deliberately leaves `
`/`` alone, so
+     * an article demonstrating TeX would otherwise be convicted on every open and still,
+     * correctly, come back unchanged.
+     */
+    private val CODE_BLOCK_REGEX = Regex(
+        "<(pre|code)\\b[^>]*>.*?",
+        setOf(RegexOption.IGNORE_CASE, RegexOption.DOT_MATCHES_ALL)
+    )
+
+    /**
+     * True when [html] is an extraction whose maths never got rendered.
+     *
+     * Rendered maths anywhere in it means extraction already had its go at this page, and
+     * nothing is to be gained by sending it round again: an expression KaTeX could not
+     * render is still in there as source and always will be.
+     */
+    fun looksLikeUnrenderedTex(html: String?): Boolean {
+        if (html.isNullOrBlank() || html.contains(" containsExpression(prose, open, close) }
+    }
+
+    private fun containsExpression(text: String, open: String, close: String): Boolean {
+        var opensAt = text.indexOf(open)
+        while (opensAt >= 0) {
+            val innerStart = opensAt + open.length
+            val closesAt = text.indexOf(close, innerStart)
+            // No closing delimiter left in the content: whatever follows is prose that
+            // happens to contain an opening one.
+            if (closesAt < 0) break
+            if (isExpression(text.substring(innerStart, closesAt))) return true
+            opensAt = text.indexOf(open, innerStart)
+        }
+        return false
+    }
+
+    private fun isExpression(inner: String): Boolean =
+        inner.isNotBlank() &&
+            inner.length <= MAX_EXPRESSION_LENGTH &&
+            // The span between two stray delimiters is markup, and markup brings its own
+            // braces and underscores along (ids, filenames, inline styles). A tag anywhere
+            // inside is on its own enough to say the two delimiters are unrelated.
+            !inner.contains('<') &&
+            inner.any { it in TEX_MARKERS }
+}
diff --git a/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt b/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt
index f08088b..9952dc5 100644
--- a/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt
+++ b/app/src/main/java/org/terst/feedreader/ui/ReaderScreen.kt
@@ -221,7 +221,8 @@ private fun ReaderContent(
 
         feedContent = loaded.feedContentHtml
         // A previously-cached extraction can be the site's cookie-consent notice rather
-        // than the article (reported live on a New Republic feature). That is dropped
+        // than the article (reported live on a New Republic feature), or an older
+        // extraction holding raw TeX source where its maths should be. Either is dropped
         // from the cache on read, which leaves nothing to show -- so re-extract, or the
         // repair would just turn a wrong article into a blank one.
         val cachedExtraction = loadCachedExtraction(loaded.extractedContent) {
@@ -239,7 +240,7 @@ private fun ReaderContent(
         if (loadedFeed?.readerModeEnabled == true) {
             isReaderMode = true
         }
-        if (loadedFeed?.readerModeEnabled == true || cachedExtraction.discardedConsentNotice) {
+        if (loadedFeed?.readerModeEnabled == true || cachedExtraction.discarded) {
             if (readerContent == null) {
                 isExtracting = true
                 val result = ReaderExtractor.extractResult(context, loaded.link)
diff --git a/app/src/main/java/org/terst/feedreader/ui/ReaderWebView.kt b/app/src/main/java/org/terst/feedreader/ui/ReaderWebView.kt
index 6d96e79..f1400d3 100644
--- a/app/src/main/java/org/terst/feedreader/ui/ReaderWebView.kt
+++ b/app/src/main/java/org/terst/feedreader/ui/ReaderWebView.kt
@@ -514,6 +514,13 @@ fun wrapReaderHtml(
        explicit width/height was deliberately sized by the page itself, so leave
        those alone -- just cap the ones that would otherwise size themselves. */
     svg:not([width]):not([height]) { max-width: 32px; max-height: 32px; }
+    /* Maths arrives as MathML, which the WebView renders itself -- no script, no webfont,
+       no stylesheet of KaTeX's (see ReaderExtractor). It only needs containing: an aligned
+       multi-line derivation is routinely wider than a phone screen, and  obeys
+       neither the img nor the svg clamp above, so without this one wide equation drags the
+       whole article into horizontal scrolling. */
+    math { max-width: 100%; }
+    math[display="block"] { display: block; overflow-x: auto; overflow-y: hidden; margin: 1em 0; }
     
     ${if (!title.isNullOrBlank()) "
${escapeHtml(title)}
" else ""}${
         if (publishedAt != null) "
${escapeHtml(absoluteDateText(publishedAt))}
" else ""
diff --git a/app/src/test/java/org/terst/feedreader/data/CachedExtractionTest.kt b/app/src/test/java/org/terst/feedreader/data/CachedExtractionTest.kt
index 72dc73f..fc9c32e 100644
--- a/app/src/test/java/org/terst/feedreader/data/CachedExtractionTest.kt
+++ b/app/src/test/java/org/terst/feedreader/data/CachedExtractionTest.kt
@@ -33,6 +33,7 @@ class CachedExtractionTest {
         val result = loadCachedExtraction(content) { cleared = true }
         assertEquals(content, result.content)
         assertFalse(result.discardedConsentNotice)
+        assertFalse(result.discarded)
         assertFalse("a good cache must not be cleared", cleared)
     }
 
@@ -54,6 +55,37 @@ class CachedExtractionTest {
         assertFalse(cleared)
     }
 
+    // Same shape of problem as the consent notice, different cause: this content was
+    // extracted before extraction knew how to render maths, so it holds the raw TeX source
+    // Substack ships. A fixed extractor never gets a look at it -- the cached copy is
+    // returned first and the article is never re-extracted.
+    @Test
+    fun `a cached extraction holding raw tex source is discarded and deleted`() = runTest {
+        var cleared = false
+        val rawTex = "
Imagine the following sentence:
" +
+            "
" +
+            "\\(p = \\text{\u201Cif }p\\text{ is true, then pigs can fly\u201D}\\)
" +
+            "
" + "Considered as a whole, the statement cannot be true. ".repeat(20) + "
"
+        val result = loadCachedExtraction(rawTex) { cleared = true }
+        assertNull("raw TeX source must not be shown as the article", result.content)
+        assertTrue(result.discardedUnrenderedTex)
+        assertTrue("the stale row must be cleared so a re-extract can replace it", cleared)
+        assertTrue("the caller must be told to extract again", result.discarded)
+    }
+
+    @Test
+    fun `an extraction with rendered maths is kept`() = runTest {
+        var cleared = false
+        val withMathMl = "
A slice of the set looks like this:
" +
+            "" +
+            "p=" +
+            "
" + "The rest of the article continues from there. ".repeat(20) + "
"
+        val result = loadCachedExtraction(withMathMl) { cleared = true }
+        assertEquals(withMathMl, result.content)
+        assertFalse(result.discardedUnrenderedTex)
+        assertFalse("a good cache must not be cleared", cleared)
+    }
+
     // A blank value is as good as nothing cached -- it is not a consent notice, so
     // reporting it as a discarded one would make the caller re-extract on a false
     // premise.
diff --git a/app/src/test/java/org/terst/feedreader/readability/UnrenderedTexTest.kt b/app/src/test/java/org/terst/feedreader/readability/UnrenderedTexTest.kt
new file mode 100644
index 0000000..016b148
--- /dev/null
+++ b/app/src/test/java/org/terst/feedreader/readability/UnrenderedTexTest.kt
@@ -0,0 +1,116 @@
+package org.terst.feedreader.readability
+
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+/**
+ * Recognising a cached extraction that still holds raw TeX source.
+ *
+ * Substack ships maths as TeX source text in the page (`\(p = \text{...}\)` inside a
+ * `latex-rendered` wrapper) and renders it client-side with its own script, which never
+ * runs in this app. Extraction now converts that source to MathML before Readability sees
+ * it -- but an article extracted BEFORE that existed has the raw source sitting in
+ * `articles.extractedContent`, and every subsequent open reads it straight back out. The
+ * reported article came with "extractedContent cached: true", so this is the half a fixed
+ * extractor cannot reach.
+ *
+ * Over-detecting is the real risk: a false positive makes the article re-extract on every
+ * single open, since re-extracting cannot change a verdict the content itself causes. So
+ * the bar is a complete delimiter pair around something that actually looks like TeX, and
+ * never anything already carrying rendered MathML.
+ */
+class UnrenderedTexTest {
+
+    // "$$" cannot be written inline in a Kotlin string followed by a letter -- that parses
+    // as a template expression.
+    private val dollars = "$" + "$"
+
+    @Test
+    fun `substack's inline-delimited tex source is recognised`() {
+        assertTrue(
+            UnrenderedTex.looksLikeUnrenderedTex(
+                "
" +
+                    "\\(p = \\text{“if }p\\text{ is true, then pigs can fly”}\\)
"
+            )
+        )
+    }
+
+    @Test
+    fun `bracket-delimited display tex source is recognised`() {
+        assertTrue(UnrenderedTex.looksLikeUnrenderedTex("
\\[\\begin{align} a &= b \\end{align}\\]
"))
+    }
+
+    @Test
+    fun `double-dollar display tex source is recognised`() {
+        assertTrue(UnrenderedTex.looksLikeUnrenderedTex("
" + dollars + "x_{1} + y^{2}" + dollars + "
"))
+    }
+
+    @Test
+    fun `content already carrying rendered mathml is left alone`() {
+        assertFalse(
+            UnrenderedTex.looksLikeUnrenderedTex(
+                "
p
"
+            )
+        )
+    }
+
+    // An expression KaTeX could not render stays in the output as source. If the presence of
+    // any source at all convicted the whole article, that article would re-extract on every
+    // open, for ever, and never come out any different. Rendered maths anywhere in the
+    // content is proof the extraction already had its go at it.
+    @Test
+    fun `a leftover unrenderable expression alongside rendered mathml does not convict`() {
+        assertFalse(
+            UnrenderedTex.looksLikeUnrenderedTex(
+                "
a
\\(\\thisIsNotRealTex{}\\)
"
+            )
+        )
+    }
+
+    @Test
+    fun `ordinary prose is not tex`() {
+        assertFalse(
+            UnrenderedTex.looksLikeUnrenderedTex(
+                "
The repair bill came to $$ in the end; the second quote was $$ as well, and (as it " +
+                    "turned out) the warranty had lapsed anyway.
"
+            )
+        )
+    }
+
+    // The inner span between two stray delimiters is HTML, not one expression -- markup
+    // brings its own underscores and braces along (ids, filenames, inline styles), so a tag
+    // anywhere inside is on its own enough to say these two delimiters are unrelated.
+    @Test
+    fun `delimiters spanning real markup are not one expression`() {
+        assertFalse(
+            UnrenderedTex.looksLikeUnrenderedTex(
+                "
It cost $$ for the part, " +
+                    "and $$ again for the labour.
"
+            )
+        )
+    }
+
+    @Test
+    fun `an unclosed delimiter is not tex`() {
+        assertFalse(UnrenderedTex.looksLikeUnrenderedTex("
Then he wrote \\(x, trailed off, and left.
"))
+    }
+
+    // Extraction deliberately skips 
/ when rendering maths -- an article ABOUT
+    // TeX quotes the source on purpose. Convicting on that would re-extract it on every
+    // open and still, correctly, change nothing.
+    @Test
+    fun `tex quoted inside a code block is not a stale extraction`() {
+        assertFalse(
+            UnrenderedTex.looksLikeUnrenderedTex(
+                "
Write it like this:
\\(x^{2} + y^{2}\\)
"
+            )
+        )
+    }
+
+    @Test
+    fun `nothing cached is not tex`() {
+        assertFalse(UnrenderedTex.looksLikeUnrenderedTex(null))
+        assertFalse(UnrenderedTex.looksLikeUnrenderedTex("   "))
+    }
+}
diff --git a/app/src/test/java/org/terst/feedreader/ui/ReaderMathTest.kt b/app/src/test/java/org/terst/feedreader/ui/ReaderMathTest.kt
new file mode 100644
index 0000000..fea5d22
--- /dev/null
+++ b/app/src/test/java/org/terst/feedreader/ui/ReaderMathTest.kt
@@ -0,0 +1,46 @@
+package org.terst.feedreader.ui
+
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+/**
+ * The reader's end of maths rendering.
+ *
+ * Extraction converts a page's TeX source to MathML (see ReaderExtractor), which the
+ * WebView renders natively -- no script, no webfont, no stylesheet of KaTeX's. Two things
+ * still have to be true of the reader HTML itself: the MathML has to reach the WebView
+ * intact (the wrapping passes rewrite iframes and images, and must not touch it), and a
+ * wide equation must not be able to drag the whole article into horizontal scrolling --
+ * an aligned multi-line derivation is routinely wider than a phone screen, and `math`
+ * does not obey the `img`/`svg` clamps already in the stylesheet.
+ */
+class ReaderMathTest {
+
+    private val displayMath =
+        "" +
+            "t"
+
+    @Test
+    fun `mathml reaches the webview unchanged`() {
+        val html = wrapReaderHtml("
A slice of the set:
$displayMath
and so on.
")
+        assertTrue("MathML must survive the reader's HTML assembly verbatim", html.contains(displayMath))
+    }
+
+    @Test
+    fun `a wide equation scrolls inside itself instead of scrolling the article`() {
+        val html = wrapReaderHtml("
x
$displayMath")
+        val style = html.substringAfter("")
+        val displayMathRule = style.lines()
+            .joinToString(" ")
+            .substringAfter("math[display=\"block\"]", "")
+            .substringBefore("}")
+        assertTrue(
+            "the stylesheet needs a math[display=\"block\"] rule, found none in:\n$style",
+            displayMathRule.isNotBlank()
+        )
+        assertTrue(
+            "display maths must scroll within its own box, got: $displayMathRule",
+            displayMathRule.contains("overflow-x: auto")
+        )
+    }
+}
-- 
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