BidiDirection [fact] v1.0.0

RTL (right-to-left) scripts — Arabic, Hebrew, Persian, Urdu, Yiddish, Aramaic — require bidirectional text rendering specified by the Unicode Bidirectional Algorithm (UAX #9). Layouts must mirror, but specific elements (numerals, code, logos, media controls) must NOT mirror.

The Unicode Bidirectional Algorithm (UAX #9) defines how mixed-direction text is laid out: paragraph-level direction (set by dir='rtl' or auto-detection from first strong character) plus per-character direction inherent in the Unicode codepoint (e.g. Latin letters are LTR, Arabic letters are RTL, digits 0-9 are weak). When dir='rtl' is set on the HTML root or container: (1) inline text flows right-to-left; (2) block layout flips — left becomes right, padding-left becomes the start side; (3) flexbox row reverses unless flex-direction: row is forced; (4) CSS logical properties (margin-inline-start, padding-inline-end, inset-inline) automatically adapt; (5) physical properties (margin-left, right) do NOT adapt. Native HTML elements with dir='auto' (e.g. , ) detect direction from the first strong character per paragraph. The <bdi> element isolates user-supplied bidirectional content from surrounding context.</p> </blockquote> </div> </div> <div class="proj-panel" data-panel="core" hidden data-astro-cid-ztpy2nk5> <p class="proj-when" data-astro-cid-ztpy2nk5>Loaded when retrieval picks the atom as adjacent / supporting.</p> <div class="atom-prose" data-astro-cid-ztpy2nk5><h1>BidiDirection [fact] v1.0.0</h1> <p>RTL (right-to-left) scripts — Arabic, Hebrew, Persian, Urdu, Yiddish, Aramaic — require bidirectional text rendering specified by the Unicode Bidirectional Algorithm (UAX #9). Layouts must mirror, but specific elements (numerals, code, logos, media controls) must NOT mirror.</p> <blockquote> <p>The Unicode Bidirectional Algorithm (UAX #9) defines how mixed-direction text is laid out: paragraph-level direction (set by <code>dir='rtl'</code> or auto-detection from first strong character) plus per-character direction inherent in the Unicode codepoint (e.g. Latin letters are LTR, Arabic letters are RTL, digits 0-9 are weak). When <code>dir='rtl'</code> is set on the HTML root or container: (1) inline text flows right-to-left; (2) block layout flips — left becomes right, padding-left becomes the start side; (3) flexbox <code>row</code> reverses unless <code>flex-direction: row</code> is forced; (4) CSS logical properties (margin-inline-start, padding-inline-end, inset-inline) automatically adapt; (5) physical properties (margin-left, right) do NOT adapt. Native HTML elements with <code>dir='auto'</code> (e.g. <input>, <textarea>) detect direction from the first strong character per paragraph. The <bdi> element isolates user-supplied bidirectional content from surrounding context.</p> </blockquote> <h2>Confidence</h2> <p>strong</p> <h2>Applies To</h2> <ul> <li>Any product surface that renders content in Arabic, Hebrew, Persian, Urdu, Yiddish, Pashto, Sindhi, Dhivehi</li> <li>User-generated content displayed inline with chrome (comments, names, messages)</li> <li>Forms accepting RTL input (search boxes, content editors)</li> <li>Logos containing text — must NOT mirror; use brand asset</li> <li>Number-heavy interfaces (digits remain LTR even within RTL paragraphs — '123' reads left-to-right inside an Arabic sentence)</li> </ul> <h2>Quantitative</h2> <ul> <li><strong>Rtl Script Speakers</strong>: Arabic ~420M, Persian/Farsi ~110M, Urdu ~230M, Hebrew ~9M — total ~770M RTL-script speakers globally</li> <li><strong>Elements That Mirror</strong>: Layout: navigation, sidebars, breadcrumbs, progress bars, tab order. Icons: chevrons (next/prev), arrows, undo/redo, slide direction.</li> <li><strong>Elements That Do NOT Mirror</strong>: Numbers (0-9 always LTR), code blocks, music notation, time-of-day '3:45', media playback controls (play/pause/stop), brand logos with text, phone numbers, scientific formulas</li> <li><strong>Bidi Control Chars</strong>: U+202A LRE, U+202B RLE, U+202C PDF (deprecated for HTML — use <bdi>/<bdo> + dir attribute instead)</li> </ul> <h2>Counter Conditions</h2> <ul> <li>RTL is not just 'CSS direction: rtl' — chevrons, sliders, animation directions, and toast slide-ins all need mirroring; this is layout work, not a CSS one-liner.</li> <li><code>text-align: right</code> is NOT equivalent to RTL. RTL paragraphs naturally start at the right; explicit text-align overrides natural flow and is usually wrong.</li> <li>Bidirectional embedding controls (LRE/RLE) must NEVER appear in HTML attributes or URL query strings — they cause security issues (RTL Override attack, CVE-2021-42574 'Trojan Source').</li> <li>Mixing CJK and RTL scripts (rare) requires explicit <bdi> / <bdo> wrapping; UAX #9 leaves some cases ambiguous.</li> <li>Mobile gesture conventions (swipe to go back) are physical-direction-anchored — iOS keeps swipe-from-left as 'back' regardless of RTL, but the visual chevron mirrors. Test on real devices.</li> </ul> </div> </div> <div class="proj-panel" data-panel="full" hidden data-astro-cid-ztpy2nk5> <p class="proj-when" data-astro-cid-ztpy2nk5>Loaded when retrieval picks the atom as a focal / direct hit.</p> <div class="atom-prose" data-astro-cid-ztpy2nk5><h1>BidiDirection [fact] v1.0.0</h1> <p>RTL (right-to-left) scripts — Arabic, Hebrew, Persian, Urdu, Yiddish, Aramaic — require bidirectional text rendering specified by the Unicode Bidirectional Algorithm (UAX #9). Layouts must mirror, but specific elements (numerals, code, logos, media controls) must NOT mirror.</p> <blockquote> <p>The Unicode Bidirectional Algorithm (UAX #9) defines how mixed-direction text is laid out: paragraph-level direction (set by <code>dir='rtl'</code> or auto-detection from first strong character) plus per-character direction inherent in the Unicode codepoint (e.g. Latin letters are LTR, Arabic letters are RTL, digits 0-9 are weak). When <code>dir='rtl'</code> is set on the HTML root or container: (1) inline text flows right-to-left; (2) block layout flips — left becomes right, padding-left becomes the start side; (3) flexbox <code>row</code> reverses unless <code>flex-direction: row</code> is forced; (4) CSS logical properties (margin-inline-start, padding-inline-end, inset-inline) automatically adapt; (5) physical properties (margin-left, right) do NOT adapt. Native HTML elements with <code>dir='auto'</code> (e.g. <input>, <textarea>) detect direction from the first strong character per paragraph. The <bdi> element isolates user-supplied bidirectional content from surrounding context.</p> </blockquote> <h2>Confidence</h2> <p>strong</p> <h2>Applies To</h2> <ul> <li>Any product surface that renders content in Arabic, Hebrew, Persian, Urdu, Yiddish, Pashto, Sindhi, Dhivehi</li> <li>User-generated content displayed inline with chrome (comments, names, messages)</li> <li>Forms accepting RTL input (search boxes, content editors)</li> <li>Logos containing text — must NOT mirror; use brand asset</li> <li>Number-heavy interfaces (digits remain LTR even within RTL paragraphs — '123' reads left-to-right inside an Arabic sentence)</li> </ul> <h2>Quantitative</h2> <ul> <li><strong>Rtl Script Speakers</strong>: Arabic ~420M, Persian/Farsi ~110M, Urdu ~230M, Hebrew ~9M — total ~770M RTL-script speakers globally</li> <li><strong>Elements That Mirror</strong>: Layout: navigation, sidebars, breadcrumbs, progress bars, tab order. Icons: chevrons (next/prev), arrows, undo/redo, slide direction.</li> <li><strong>Elements That Do NOT Mirror</strong>: Numbers (0-9 always LTR), code blocks, music notation, time-of-day '3:45', media playback controls (play/pause/stop), brand logos with text, phone numbers, scientific formulas</li> <li><strong>Bidi Control Chars</strong>: U+202A LRE, U+202B RLE, U+202C PDF (deprecated for HTML — use <bdi>/<bdo> + dir attribute instead)</li> </ul> <h2>Counter Conditions</h2> <ul> <li>RTL is not just 'CSS direction: rtl' — chevrons, sliders, animation directions, and toast slide-ins all need mirroring; this is layout work, not a CSS one-liner.</li> <li><code>text-align: right</code> is NOT equivalent to RTL. RTL paragraphs naturally start at the right; explicit text-align overrides natural flow and is usually wrong.</li> <li>Bidirectional embedding controls (LRE/RLE) must NEVER appear in HTML attributes or URL query strings — they cause security issues (RTL Override attack, CVE-2021-42574 'Trojan Source').</li> <li>Mixing CJK and RTL scripts (rare) requires explicit <bdi> / <bdo> wrapping; UAX #9 leaves some cases ambiguous.</li> <li>Mobile gesture conventions (swipe to go back) are physical-direction-anchored — iOS keeps swipe-from-left as 'back' regardless of RTL, but the visual chevron mirrors. Test on real devices.</li> </ul> <h2>Sources</h2> <h2>Confidence</h2> <p>strong</p> <h2>Source</h2> <ul> <li>Unicode Standard Annex #9 — 'Unicode Bidirectional Algorithm' (UAX #9)</li> <li>W3C Internationalization — 'Authoring HTML & CSS' bidi guidance</li> <li>MDN — CSS logical properties (margin-inline-start, padding-block-end, etc.)</li> <li>Mozilla RTL guidelines — Firefox UI internationalization</li> <li>Material Design — Bidirectionality guidelines</li> </ul> <h2>Applies To</h2> <ul> <li>Any product surface that renders content in Arabic, Hebrew, Persian, Urdu, Yiddish, Pashto, Sindhi, Dhivehi</li> <li>User-generated content displayed inline with chrome (comments, names, messages)</li> <li>Forms accepting RTL input (search boxes, content editors)</li> <li>Logos containing text — must NOT mirror; use brand asset</li> <li>Number-heavy interfaces (digits remain LTR even within RTL paragraphs — '123' reads left-to-right inside an Arabic sentence)</li> </ul> <h2>Quantitative</h2> <ul> <li><strong>Rtl Script Speakers</strong>: Arabic ~420M, Persian/Farsi ~110M, Urdu ~230M, Hebrew ~9M — total ~770M RTL-script speakers globally</li> <li><strong>Elements That Mirror</strong>: Layout: navigation, sidebars, breadcrumbs, progress bars, tab order. Icons: chevrons (next/prev), arrows, undo/redo, slide direction.</li> <li><strong>Elements That Do NOT Mirror</strong>: Numbers (0-9 always LTR), code blocks, music notation, time-of-day '3:45', media playback controls (play/pause/stop), brand logos with text, phone numbers, scientific formulas</li> <li><strong>Bidi Control Chars</strong>: U+202A LRE, U+202B RLE, U+202C PDF (deprecated for HTML — use <bdi>/<bdo> + dir attribute instead)</li> </ul> <h2>Counter Conditions</h2> <ul> <li>RTL is not just 'CSS direction: rtl' — chevrons, sliders, animation directions, and toast slide-ins all need mirroring; this is layout work, not a CSS one-liner.</li> <li><code>text-align: right</code> is NOT equivalent to RTL. RTL paragraphs naturally start at the right; explicit text-align overrides natural flow and is usually wrong.</li> <li>Bidirectional embedding controls (LRE/RLE) must NEVER appear in HTML attributes or URL query strings — they cause security issues (RTL Override attack, CVE-2021-42574 'Trojan Source').</li> <li>Mixing CJK and RTL scripts (rare) requires explicit <bdi> / <bdo> wrapping; UAX #9 leaves some cases ambiguous.</li> <li>Mobile gesture conventions (swipe to go back) are physical-direction-anchored — iOS keeps swipe-from-left as 'back' regardless of RTL, but the visual chevron mirrors. Test on real devices.</li> </ul> <h2>Derived From</h2> <p>@community/rule-rtl-directional-icons-flip</p> </div> </div> </section> <section class="atom-section" data-astro-cid-ztpy2nk5> <header class="atom-section-h" data-astro-cid-ztpy2nk5> <h2 data-astro-cid-ztpy2nk5>Source</h2> <span class="atom-section-meta" data-astro-cid-ztpy2nk5>where the compiled artifact came from</span> </header> <pre class="atom-source" data-astro-cid-ztpy2nk5><code data-astro-cid-ztpy2nk5>prime-system/examples/frontend-design/primes/compiled/@community/fact-bidi-direction/atom.yaml</code></pre> <p class="atom-source-meta" data-astro-cid-ztpy2nk5>Compiled at <strong data-astro-cid-ztpy2nk5>2026-05-07</strong></p> </section> </main> <aside class="atom-side" aria-label="Edges and graph" data-astro-cid-ztpy2nk5> <div class="atom-side-card" data-astro-cid-ztpy2nk5> <div class="atom-side-graph" data-astro-cid-ztpy2nk5> <figure class="mini-graph" aria-label="Related atoms graph" data-astro-cid-fdlvampy><svg viewBox="0 0 480 300" role="img" aria-labelledby="graph-title" data-astro-cid-fdlvampy><title id="graph-title">Edges from @community/fact-bidi-direction</title><line class="mg-edge mg-edge-out" x1="240" y1="150" x2="240" y2="45" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-out" x1="240" y1="150" x2="301.71745149070966" y2="65.05321559063051" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-out" x1="240" y1="150" x2="339.8609342109911" y2="117.55321559063051" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-out" x1="240" y1="150" x2="339.8609342109911" y2="182.44678440936949" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-out" x1="240" y1="150" x2="301.71745149070966" y2="234.94678440936949" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-out" x1="240" y1="150" x2="240" y2="255" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-in" x1="240" y1="150" x2="178.28254850929034" y2="234.94678440936949" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-in" x1="240" y1="150" x2="140.1390657890089" y2="182.44678440936949" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-in" x1="240" y1="150" x2="140.13906578900887" y2="117.55321559063054" data-astro-cid-fdlvampy></line><line class="mg-edge mg-edge-in" x1="240" y1="150" x2="178.2825485092903" y2="65.05321559063053" data-astro-cid-fdlvampy></line><g data-astro-cid-fdlvampy><circle class="mg-node" cx="240" cy="45" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="240" y="35" data-astro-cid-fdlvampy>rule-rtl-direction…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="301.71745149070966" cy="65.05321559063051" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="301.71745149070966" y="55.053215590630515" data-astro-cid-fdlvampy>anti-pattern-flag-…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="339.8609342109911" cy="117.55321559063051" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="339.8609342109911" y="107.55321559063051" data-astro-cid-fdlvampy>pattern-icu-messag…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="339.8609342109911" cy="182.44678440936949" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="339.8609342109911" y="200.44678440936949" data-astro-cid-fdlvampy>principle-no-strin…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="301.71745149070966" cy="234.94678440936949" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="301.71745149070966" y="252.94678440936949" data-astro-cid-fdlvampy>rule-intl-api-loca…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="240" cy="255" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="240" y="273" data-astro-cid-fdlvampy>rule-rtl-direction…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="178.28254850929034" cy="234.94678440936949" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="178.28254850929034" y="252.94678440936949" data-astro-cid-fdlvampy>collection-i18n-re…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="140.1390657890089" cy="182.44678440936949" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="140.1390657890089" y="200.44678440936949" data-astro-cid-fdlvampy>collection-i18n-re…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="140.13906578900887" cy="117.55321559063054" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="140.13906578900887" y="107.55321559063054" data-astro-cid-fdlvampy>anti-pattern-flag-…</text></g><g data-astro-cid-fdlvampy><circle class="mg-node" cx="178.2825485092903" cy="65.05321559063053" r="5" data-astro-cid-fdlvampy></circle><text class="mg-label" x="178.2825485092903" y="55.05321559063053" data-astro-cid-fdlvampy>feedback-i18n-laun…</text></g><circle class="mg-center" cx="240" cy="150" r="11" data-astro-cid-fdlvampy></circle><text class="mg-center-label" x="240" y="178" data-astro-cid-fdlvampy>fact-bidi-direction</text></svg><figcaption data-astro-cid-fdlvampy>6 outgoing · 8 incoming </figcaption></figure> </div> <div class="atom-side-section" data-astro-cid-ztpy2nk5> <header class="atom-side-h" data-astro-cid-ztpy2nk5> <span class="dir-arrow" aria-hidden="true" data-astro-cid-ztpy2nk5>↗</span> <span data-astro-cid-ztpy2nk5>Outgoing</span> <span class="atom-side-count" data-astro-cid-ztpy2nk5>6</span> </header> <div class="edge-group" data-astro-cid-ztpy2nk5> <div class="edge-verb-row" data-astro-cid-ztpy2nk5> <span class="edge-verb" data-astro-cid-ztpy2nk5>derived-from</span> <span class="edge-verb-count" data-astro-cid-ztpy2nk5>1</span> </div> <ul class="edge-list" data-astro-cid-ztpy2nk5> <li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/rule-rtl-directional-icons-flip" title="@community/rule-rtl-directional-icons-flip" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/rule-rtl-directional-icons-flip</code> </a> </li> </ul> </div><div class="edge-group" data-astro-cid-ztpy2nk5> <div class="edge-verb-row" data-astro-cid-ztpy2nk5> <span class="edge-verb" data-astro-cid-ztpy2nk5>related</span> <span class="edge-verb-count" data-astro-cid-ztpy2nk5>5</span> </div> <ul class="edge-list" data-astro-cid-ztpy2nk5> <li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/anti-pattern-flag-as-language" title="@community/anti-pattern-flag-as-language" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/anti-pattern-flag-as-language</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/pattern-icu-message-format" title="@community/pattern-icu-message-format" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/pattern-icu-message-format</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/principle-no-string-concat" title="@community/principle-no-string-concat" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/principle-no-string-concat</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/rule-intl-api-locale-formatting" title="@community/rule-intl-api-locale-formatting" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/rule-intl-api-locale-formatting</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/rule-rtl-directional-icons-flip" title="@community/rule-rtl-directional-icons-flip" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/rule-rtl-directional-icons-flip</code> </a> </li> </ul> </div> </div> <div class="atom-side-section" data-astro-cid-ztpy2nk5> <header class="atom-side-h" data-astro-cid-ztpy2nk5> <span class="dir-arrow" aria-hidden="true" data-astro-cid-ztpy2nk5>↘</span> <span data-astro-cid-ztpy2nk5>Incoming</span> <span class="atom-side-count" data-astro-cid-ztpy2nk5>8</span> </header> <div class="edge-group" data-astro-cid-ztpy2nk5> <div class="edge-verb-row" data-astro-cid-ztpy2nk5> <span class="edge-verb" data-astro-cid-ztpy2nk5>includes</span> <span class="edge-verb-count" data-astro-cid-ztpy2nk5>1</span> </div> <ul class="edge-list" data-astro-cid-ztpy2nk5> <li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/collection-i18n-ready-component" title="@community/collection-i18n-ready-component" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/collection-i18n-ready-component</code> </a> </li> </ul> </div><div class="edge-group" data-astro-cid-ztpy2nk5> <div class="edge-verb-row" data-astro-cid-ztpy2nk5> <span class="edge-verb" data-astro-cid-ztpy2nk5>related</span> <span class="edge-verb-count" data-astro-cid-ztpy2nk5>7</span> </div> <ul class="edge-list" data-astro-cid-ztpy2nk5> <li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/collection-i18n-ready-component" title="@community/collection-i18n-ready-component" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/collection-i18n-ready-component</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/anti-pattern-flag-as-language" title="@community/anti-pattern-flag-as-language" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/anti-pattern-flag-as-language</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/feedback-i18n-launch-v1" title="@community/feedback-i18n-launch-v1" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/feedback-i18n-launch-v1</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/pattern-icu-message-format" title="@community/pattern-icu-message-format" data-astro-cid-ztpy2nk5> <code data-astro-cid-ztpy2nk5>@community/pattern-icu-message-format</code> </a> </li><li data-astro-cid-ztpy2nk5> <a href="/atom/frontend-design/principle-no-string-concat" title="@community/principle-no-string-concat" 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