diff --git a/docs/_docset.yml b/docs/_docset.yml index 4c87c4e85..ff445d4cb 100644 --- a/docs/_docset.yml +++ b/docs/_docset.yml @@ -102,6 +102,7 @@ toc: - file: icons.md - file: images.md - file: kbd.md + - file: math.md - file: lists.md - file: line_breaks.md - file: links.md diff --git a/docs/syntax/directives.md b/docs/syntax/directives.md index 2984deb28..f0d4b3c48 100644 --- a/docs/syntax/directives.md +++ b/docs/syntax/directives.md @@ -72,6 +72,7 @@ The following directives are available: - [Dropdowns](dropdowns.md) - Collapsible content - [Images](images.md) - Enhanced image handling - [Include](file_inclusion.md) - Include content from other files +- [Math](math.md) - Mathematical expressions and equations - [Settings](automated_settings.md) - Configuration blocks - [Stepper](stepper.md) - Step-by-step content - [Tabs](tabs.md) - Tabbed content organization diff --git a/docs/syntax/math.md b/docs/syntax/math.md new file mode 100644 index 000000000..3e0233085 --- /dev/null +++ b/docs/syntax/math.md @@ -0,0 +1,141 @@ +# Math + +The `math` directive renders mathematical expressions using LaTeX syntax. Mathematical expressions are rendered client-side using KaTeX for fast, accurate display. + +## Basic usage + +:::::{tab-set} + +::::{tab-item} Preview + +:::{math} +S(doc) = exp(\lambda \cdot max(0, |fieldvalue_{doc} - origin| - offset)) +::: + +:::: + +::::{tab-item} Markdown + +```markdown +:::{math} +S(doc) = exp(\lambda \cdot max(0, |fieldvalue_{doc} - origin| - offset)) +::: +``` + +:::: + +::::: + +## Display math + +For block-level mathematical expressions, use display math syntax: + +:::::{tab-set} + +::::{tab-item} Preview + +:::{math} +\[ +\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi} +\] +::: + +:::: + +::::{tab-item} Markdown + +```markdown +:::{math} +\[ +\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi} +\] +::: +``` + +:::: + +::::: + +The directive automatically detects display math based on: +- LaTeX display delimiters: `\[` and `\]` +- TeX display delimiters: `$$` and `$$` +- LaTeX environments: `\begin{...}` and `\end{...}` +- Multi-line expressions +- Complex expressions containing `\frac`, `\sum`, `\int`, `\lim`, etc. + +## Adding labels + +Label mathematical expressions for cross-referencing: + +:::::{tab-set} + +::::{tab-item} Preview + +:::{math} +:label: einstein-equation +E = mc^2 +::: + +:::: + +::::{tab-item} Markdown + +```markdown +:::{math} +:label: einstein-equation +E = mc^2 +::: +``` + +:::: + +::::: + +This creates an element with `id="einstein-equation"` that can be referenced elsewhere in the document. + +## Complex expressions + +The math directive supports complex LaTeX expressions: + +:::::{tab-set} + +::::{tab-item} Preview + +:::{math} +\begin{align} +\frac{\partial f}{\partial x} &= \lim_{h \to 0} \frac{f(x+h) - f(x)}{h} \\ +\nabla \cdot \vec{E} &= \frac{\rho}{\epsilon_0} +\end{align} +::: + +:::: + +::::{tab-item} Markdown + +```markdown +:::{math} +\begin{align} +\frac{\partial f}{\partial x} &= \lim_{h \to 0} \frac{f(x+h) - f(x)}{h} \\ +\nabla \cdot \vec{E} &= \frac{\rho}{\epsilon_0} +\end{align} +::: +``` + +:::: + +::::: + +## Supported LaTeX features + +The math directive supports most common LaTeX mathematical notation: + +- **Fractions**: `\frac{numerator}{denominator}` +- **Superscripts and subscripts**: `x^2`, `x_i` +- **Integrals**: `\int`, `\iint`, `\iiint` +- **Sums and products**: `\sum`, `\prod` +- **Limits**: `\lim`, `\limsup`, `\liminf` +- **Greek letters**: `\alpha`, `\beta`, `\gamma`, etc. +- **Matrices**: `\begin{matrix}`, `\begin{pmatrix}`, etc. +- **Aligned equations**: `\begin{align}`, `\begin{eqnarray}` +- **Roots**: `\sqrt{x}`, `\sqrt[n]{x}` +- **Operators**: `\sin`, `\cos`, `\log`, `\exp`, etc. diff --git a/src/Elastic.Documentation.Site/Assets/main.ts b/src/Elastic.Documentation.Site/Assets/main.ts index ec0f22c6f..cfc432cf4 100644 --- a/src/Elastic.Documentation.Site/Assets/main.ts +++ b/src/Elastic.Documentation.Site/Assets/main.ts @@ -10,6 +10,8 @@ import { initTabs } from './tabs' import { initTocNav } from './toc-nav' import 'htmx-ext-head-support' import 'htmx-ext-preload' +import katex from 'katex' +import 'katex/dist/katex.min.css' import { $, $$ } from 'select-dom' import { UAParser } from 'ua-parser-js' @@ -17,12 +19,58 @@ const { getOS } = new UAParser() const isLazyLoadNavigationEnabled = $('meta[property="docs:feature:lazy-load-navigation"]')?.content === 'true' +/** + * Initialize KaTeX math rendering for elements with class 'math' + */ +function initMath() { + const mathElements = $$('.math') + mathElements.forEach((element) => { + try { + const content = element.textContent?.trim() + if (!content) return + + // Determine if this is display math based on content and element type + const isDisplayMath = + element.tagName === 'DIV' || + content.includes('\\[') || + content.includes('$$') || + content.includes('\\begin{') || + content.includes('\n') + + // Clean up common LaTeX delimiters + const cleanContent = content + .replace(/^\$\$|\$\$$/g, '') // Remove $$ delimiters + .replace(/^\\\[|\\\]$/g, '') // Remove \[ \] delimiters + .trim() + + // Clear the element content before rendering + element.innerHTML = '' + + katex.render(cleanContent, element, { + throwOnError: false, + displayMode: isDisplayMath, + strict: false, // Allow some LaTeX extensions + trust: false, // Security: don't trust arbitrary commands + output: 'mathml', // Only render MathML, not HTML + macros: { + // Add common macros if needed + }, + }) + } catch (error) { + console.warn('KaTeX rendering error:', error) + // Fallback: keep the original content + element.innerHTML = element.textContent || '' + } + }) +} + document.addEventListener('htmx:load', function (event) { initTocNav() initHighlight() initCopyButton() initTabs() initAppliesSwitch() + initMath() // We do this so that the navigation is not initialized twice if (isLazyLoadNavigationEnabled) { diff --git a/src/Elastic.Documentation.Site/Assets/styles.css b/src/Elastic.Documentation.Site/Assets/styles.css index e515379a8..b8eb69260 100644 --- 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a/src/Elastic.Documentation.Site/package-lock.json +++ b/src/Elastic.Documentation.Site/package-lock.json @@ -21,6 +21,7 @@ "htmx-ext-head-support": "2.0.4", "htmx-ext-preload": "2.1.1", "htmx.org": "2.0.7", + "katex": "^0.16.25", "marked": "16.4.0", "select-dom": "9.4.0", "tailwindcss": "4.1.14", @@ -44,6 +45,7 @@ "@testing-library/user-event": "14.6.1", "@trivago/prettier-plugin-sort-imports": "5.2.2", "@types/jest": "30.0.0", + "@types/katex": "^0.16.7", "@types/testing-library__jest-dom": "6.0.0", "babel-jest": "30.2.0", "eslint": "9.37.0", @@ -7273,6 +7275,13 @@ "dev": true, "license": "MIT" }, + "node_modules/@types/katex": { + "version": "0.16.7", + "resolved": "https://registry.npmjs.org/@types/katex/-/katex-0.16.7.tgz", + "integrity": "sha512-HMwFiRujE5PjrgwHQ25+bsLJgowjGjm5Z8FVSf0N6PwgJrwxH0QxzHYDcKsTfV3wva0vzrpqMTJS2jXPr5BMEQ==", + "dev": true, + "license": "MIT" + }, "node_modules/@types/lodash": { "version": "4.17.20", "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.17.20.tgz", @@ -12076,6 +12085,31 @@ "node": ">=6" } }, + "node_modules/katex": { + "version": "0.16.25", + "resolved": "https://registry.npmjs.org/katex/-/katex-0.16.25.tgz", + "integrity": "sha512-woHRUZ/iF23GBP1dkDQMh1QBad9dmr8/PAwNA54VrSOVYgI12MAcE14TqnDdQOdzyEonGzMepYnqBMYdsoAr8Q==", + "funding": [ + "https://opencollective.com/katex", + "https://github.com/sponsors/katex" + ], + "license": "MIT", + "dependencies": { + "commander": "^8.3.0" + }, + "bin": { + "katex": "cli.js" + } + }, + "node_modules/katex/node_modules/commander": { + "version": "8.3.0", + "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz", + "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==", + "license": "MIT", + "engines": { + "node": ">= 12" + } + }, "node_modules/keyv": { "version": "4.5.4", "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz", diff --git a/src/Elastic.Documentation.Site/package.json b/src/Elastic.Documentation.Site/package.json index dd52ecc20..24496405a 100644 --- a/src/Elastic.Documentation.Site/package.json +++ b/src/Elastic.Documentation.Site/package.json @@ -56,6 +56,7 @@ "@testing-library/user-event": "14.6.1", "@trivago/prettier-plugin-sort-imports": "5.2.2", "@types/jest": "30.0.0", + "@types/katex": "^0.16.7", "@types/testing-library__jest-dom": "6.0.0", "babel-jest": "30.2.0", "eslint": "9.37.0", @@ -93,6 +94,7 @@ "htmx-ext-head-support": "2.0.4", "htmx-ext-preload": "2.1.1", "htmx.org": "2.0.7", + "katex": "^0.16.25", "marked": "16.4.0", "select-dom": "9.4.0", "tailwindcss": "4.1.14", diff --git a/src/Elastic.Markdown/Myst/Directives/AppliesSwitch/AppliesSwitchBlock.cs b/src/Elastic.Markdown/Myst/Directives/AppliesSwitch/AppliesSwitchBlock.cs index 221d555aa..600cd17eb 100644 --- a/src/Elastic.Markdown/Myst/Directives/AppliesSwitch/AppliesSwitchBlock.cs +++ b/src/Elastic.Markdown/Myst/Directives/AppliesSwitch/AppliesSwitchBlock.cs @@ -75,7 +75,7 @@ public static string GenerateSyncKey(string appliesToDefinition, ProductsConfigu if (applicableTo != null) { // Use the object's hash for a consistent, unique identifier - return $"applies-{Math.Abs(applicableTo.GetHashCode())}"; + return $"applies-{System.Math.Abs(applicableTo.GetHashCode())}"; } } catch diff --git a/src/Elastic.Markdown/Myst/Directives/DirectiveBlockParser.cs b/src/Elastic.Markdown/Myst/Directives/DirectiveBlockParser.cs index 87404475f..6e96f39e4 100644 --- a/src/Elastic.Markdown/Myst/Directives/DirectiveBlockParser.cs +++ b/src/Elastic.Markdown/Myst/Directives/DirectiveBlockParser.cs @@ -9,6 +9,7 @@ using Elastic.Markdown.Myst.Directives.Diagram; using Elastic.Markdown.Myst.Directives.Image; using Elastic.Markdown.Myst.Directives.Include; +using Elastic.Markdown.Myst.Directives.Math; using Elastic.Markdown.Myst.Directives.Mermaid; using Elastic.Markdown.Myst.Directives.Settings; using Elastic.Markdown.Myst.Directives.Stepper; @@ -133,6 +134,9 @@ protected override DirectiveBlock CreateFencedBlock(BlockProcessor processor) if (info.IndexOf("{csv-include}") > 0) return new CsvIncludeBlock(this, context); + if (info.IndexOf("{math}") > 0) + return new MathBlock(this, context); + foreach (var admonition in _admonitions) { if (info.IndexOf($"{{{admonition}}}") > 0) @@ -186,7 +190,7 @@ public override BlockState TryOpen(BlockProcessor processor) return BlockState.None; var span = line.AsSpan(); - var lastIndent = Math.Max(span.LastIndexOf("`"), span.LastIndexOf(":")); + var lastIndent = System.Math.Max(span.LastIndexOf("`"), span.LastIndexOf(":")); var startApplies = span.IndexOf("{applies_to}"); var startOpen = span.IndexOf("{"); if (startOpen > lastIndent + 1 || startApplies != -1) diff --git a/src/Elastic.Markdown/Myst/Directives/DirectiveHtmlRenderer.cs b/src/Elastic.Markdown/Myst/Directives/DirectiveHtmlRenderer.cs index 7b2721c80..f5262cdba 100644 --- a/src/Elastic.Markdown/Myst/Directives/DirectiveHtmlRenderer.cs +++ b/src/Elastic.Markdown/Myst/Directives/DirectiveHtmlRenderer.cs @@ -13,6 +13,7 @@ using Elastic.Markdown.Myst.Directives.Dropdown; using Elastic.Markdown.Myst.Directives.Image; using Elastic.Markdown.Myst.Directives.Include; +using Elastic.Markdown.Myst.Directives.Math; using Elastic.Markdown.Myst.Directives.Mermaid; using Elastic.Markdown.Myst.Directives.Settings; using Elastic.Markdown.Myst.Directives.Stepper; @@ -93,6 +94,9 @@ protected override void Write(HtmlRenderer renderer, DirectiveBlock directiveBlo case CsvIncludeBlock csvIncludeBlock: WriteCsvIncludeBlock(renderer, csvIncludeBlock); return; + case MathBlock mathBlock: + WriteMathBlock(renderer, mathBlock); + return; case StepperBlock stepperBlock: WriteStepperBlock(renderer, stepperBlock); return; @@ -476,4 +480,26 @@ private static void WriteCsvIncludeBlock(HtmlRenderer renderer, CsvIncludeBlock var slice = CsvIncludeView.Create(viewModel); RenderRazorSlice(slice, renderer); } + + private static void WriteMathBlock(HtmlRenderer renderer, MathBlock block) + { + // Output HTML that KaTeX can render client-side + var labelAttr = !string.IsNullOrEmpty(block.Label) ? $" id=\"{block.Label}\"" : ""; + + if (block.IsDisplayMath) + { + // Display math should be a block element + _ = renderer.Write($"
"); + _ = renderer.WriteEscape(block.Content ?? ""); + _ = renderer.Write("
"); + } + else + { + // Inline math should be a span element to behave like text + _ = renderer.Write($""); + _ = renderer.WriteEscape(block.Content ?? ""); + _ = renderer.Write(""); + } + _ = renderer.EnsureLine(); + } } diff --git a/src/Elastic.Markdown/Myst/Directives/Math/MathBlock.cs b/src/Elastic.Markdown/Myst/Directives/Math/MathBlock.cs new file mode 100644 index 000000000..588116dec --- /dev/null +++ b/src/Elastic.Markdown/Myst/Directives/Math/MathBlock.cs @@ -0,0 +1,93 @@ +// Licensed to Elasticsearch B.V under one or more agreements. +// Elasticsearch B.V licenses this file to you under the Apache 2.0 License. +// See the LICENSE file in the project root for more information + +using Elastic.Markdown.Diagnostics; + +namespace Elastic.Markdown.Myst.Directives.Math; + +/// +/// Represents a math directive block for rendering mathematical expressions using LaTeX syntax. +/// Follows MyST specification: https://mystmd.org/guide/directives#directive-math +/// +public class MathBlock(DirectiveBlockParser parser, ParserContext context) : DirectiveBlock(parser, context) +{ + public override string Directive => "math"; + + /// + /// The LaTeX mathematical expression content + /// + public string? Content { get; private set; } + + /// + /// Whether this is display math (block-level) or inline math + /// + public bool IsDisplayMath { get; private set; } + + /// + /// Label for cross-referencing + /// + public string? Label { get; private set; } + + public override void FinalizeAndValidate(ParserContext context) + { + // Extract content from the directive body + Content = ExtractContent(); + + if (string.IsNullOrWhiteSpace(Content)) + { + this.EmitError("Math directive requires content."); + return; + } + + // Determine if this is display math based on content analysis + // Display math typically starts with \[ or $$ and contains block-level expressions + IsDisplayMath = DetermineDisplayMath(Content); + + // Extract label for cross-referencing + Label = Prop("label", "name"); + } + + private string? ExtractContent() + { + if (!this.Any()) + return null; + + var lines = new List(); + foreach (var block in this) + { + if (block is Markdig.Syntax.LeafBlock leafBlock) + { + var content = leafBlock.Lines.ToString(); + if (!string.IsNullOrWhiteSpace(content)) + lines.Add(content); + } + } + + return lines.Count > 0 ? string.Join("\n", lines) : null; + } + + private static bool DetermineDisplayMath(string content) + { + // Check for common display math indicators + var trimmed = content.Trim(); + + // LaTeX display math delimiters + if (trimmed.StartsWith("\\[") && trimmed.EndsWith("\\]")) + return true; + if (trimmed.StartsWith("\\begin{") && trimmed.Contains("\\end{")) + return true; + + // TeX display math delimiters + if (trimmed.StartsWith("$$") && trimmed.EndsWith("$$")) + return true; + + // Check for block-level math expressions (heuristics) + // If content contains line breaks or complex expressions, likely display math + if (content.Contains('\n') || content.Contains("\\frac") || content.Contains("\\sum") || + content.Contains("\\int") || content.Contains("\\lim") || content.Contains("\\begin")) + return true; + + return false; + } +} diff --git a/src/Elastic.Markdown/Myst/Directives/Stepper/StepperBlock.cs b/src/Elastic.Markdown/Myst/Directives/Stepper/StepperBlock.cs index e539c8376..dcf616d8c 100644 --- a/src/Elastic.Markdown/Myst/Directives/Stepper/StepperBlock.cs +++ b/src/Elastic.Markdown/Myst/Directives/Stepper/StepperBlock.cs @@ -59,7 +59,7 @@ private int CalculateHeadingLevel() if (allBlocks[i] is HeadingBlock heading) { // Step should be one level deeper than the preceding heading - return Math.Min(heading.Level + 1, 6); // Cap at h6 + return System.Math.Min(heading.Level + 1, 6); // Cap at h6 } } diff --git a/src/Elastic.Markdown/Myst/Renderers/LlmMarkdown/LlmBlockRenderers.cs b/src/Elastic.Markdown/Myst/Renderers/LlmMarkdown/LlmBlockRenderers.cs index 757b16c30..7ff7e7057 100644 --- a/src/Elastic.Markdown/Myst/Renderers/LlmMarkdown/LlmBlockRenderers.cs +++ b/src/Elastic.Markdown/Myst/Renderers/LlmMarkdown/LlmBlockRenderers.cs @@ -9,6 +9,7 @@ using Elastic.Markdown.Myst.Directives.Diagram; using Elastic.Markdown.Myst.Directives.Image; using Elastic.Markdown.Myst.Directives.Include; +using Elastic.Markdown.Myst.Directives.Math; using Elastic.Markdown.Myst.Directives.Settings; using Markdig.Extensions.DefinitionLists; using Markdig.Extensions.Tables; @@ -393,6 +394,9 @@ protected override void Write(LlmMarkdownRenderer renderer, DirectiveBlock obj) case SettingsBlock settingsBlock: WriteSettingsBlock(renderer, settingsBlock); return; + case MathBlock mathBlock: + WriteMathBlock(renderer, mathBlock); + return; } // Ensure single empty line before directive @@ -607,6 +611,32 @@ private void WriteSettingsBlock(LlmMarkdownRenderer renderer, SettingsBlock bloc renderer.EnsureLine(); } + private static void WriteMathBlock(LlmMarkdownRenderer renderer, MathBlock block) + { + renderer.EnsureBlockSpacing(); + + // Render math content in a format that's clear for LLMs + // Use LaTeX notation that LLMs can understand and process + var mathContent = block.Content ?? ""; + + // For display math, use block-level formatting + if (block.IsDisplayMath) + { + renderer.WriteLine("```math"); + renderer.WriteLine(mathContent); + renderer.WriteLine("```"); + } + else + { + // For inline math, use inline code formatting + renderer.Write("`"); + renderer.Write(mathContent); + renderer.Write("`"); + } + + renderer.EnsureLine(); + } + private static void WriteChildrenWithIndentation(LlmMarkdownRenderer renderer, Block container, string indent) { // Capture output and manually add indentation diff --git a/tests/Elastic.Markdown.Tests/Directives/MathBlockTests.cs b/tests/Elastic.Markdown.Tests/Directives/MathBlockTests.cs new file mode 100644 index 000000000..609dd7784 --- /dev/null +++ b/tests/Elastic.Markdown.Tests/Directives/MathBlockTests.cs @@ -0,0 +1,120 @@ +// Licensed to Elasticsearch B.V under one or more agreements. +// Elasticsearch B.V licenses this file to you under the Apache 2.0 License. +// See the LICENSE file in the project root for more information + +using Elastic.Documentation.Diagnostics; +using Elastic.Markdown.Myst.Directives.Math; +using FluentAssertions; + +namespace Elastic.Markdown.Tests.Directives; + +public class MathBlockTests(ITestOutputHelper output) : DirectiveTest(output, +""" +:::{math} +E = mc^2 +::: +""" +) +{ + [Fact] + public void ParsesMathBlock() => Block.Should().NotBeNull(); + + [Fact] + public void SetsCorrectDirectiveType() => Block!.Directive.Should().Be("math"); + + [Fact] + public void ExtractsContent() => Block!.Content.Should().Be("E = mc^2"); + + [Fact] + public void DeterminesInlineMath() => Block!.IsDisplayMath.Should().BeFalse(); + + [Fact] + public void RendersMathSpan() => Html.Should().Contain("E = mc^2"); +} + +public class MathBlockDisplayMathTests(ITestOutputHelper output) : DirectiveTest(output, +""" +:::{math} +\[ +\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi} +\] +::: +""" +) +{ + [Fact] + public void ParsesDisplayMathBlock() => Block.Should().NotBeNull(); + + [Fact] + public void ExtractsDisplayMathContent() => Block!.Content.Should().Contain("\\int_{-\\infty}^{\\infty}"); + + [Fact] + public void DeterminesDisplayMath() => Block!.IsDisplayMath.Should().BeTrue(); + + [Fact] + public void RendersDisplayMathDiv() => Html.Should().Contain("
"); +} + +public class MathBlockWithLabelTests(ITestOutputHelper output) : DirectiveTest(output, +""" +:::{math} +:label: einstein-mass-energy +E = mc^2 +::: +""" +) +{ + [Fact] + public void ParsesMathBlockWithLabel() => Block.Should().NotBeNull(); + + [Fact] + public void ExtractsLabel() => Block!.Label.Should().Be("einstein-mass-energy"); + + [Fact] + public void RendersWithId() => Html.Should().Contain("id=\"einstein-mass-energy\""); +} + +public class MathBlockEmptyTests(ITestOutputHelper output) : DirectiveTest(output, +""" +:::{math} +::: +""" +) +{ + [Fact] + public void EmptyContentGeneratesError() => + Collector.Errors.Should().Be(1); + + [Fact] + public void EmitsErrorForEmptyContent() + { + Collector.Diagnostics.Should().NotBeNullOrEmpty().And.HaveCount(1); + Collector.Diagnostics.Should().OnlyContain(d => d.Severity == Severity.Error); + Collector.Diagnostics.Should() + .OnlyContain(d => d.Message.StartsWith("Math directive requires content.")); + } +} + +public class MathBlockComplexExpressionTests(ITestOutputHelper output) : DirectiveTest(output, +""" +:::{math} +\begin{align} +\frac{\partial f}{\partial x} &= \lim_{h \to 0} \frac{f(x+h) - f(x)}{h} \\ +\nabla \cdot \vec{E} &= \frac{\rho}{\epsilon_0} +\end{align} +::: +""" +) +{ + [Fact] + public void ParsesComplexMathBlock() => Block.Should().NotBeNull(); + + [Fact] + public void ExtractsComplexContent() => Block!.Content.Should().Contain("\\begin{align}"); + + [Fact] + public void DeterminesDisplayMathFromBegin() => Block!.IsDisplayMath.Should().BeTrue(); + + [Fact] + public void RendersComplexMathDiv() => Html.Should().Contain("
"); +}