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<asideclass="prompts">If this script runs right-to-left, are there any issues when handling that? Is bidirectional text adequately supported? What about numbers and expressions? Do the Unicode bidi controls and HTML markup provide the support needed? Is isolation of directional runs problematic?</aside>
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<asideclass="prompts">In what direction does text flow along a line and across a page? (See the Bidirectional text section if the basic direction is right-to-left.) If the script uses vertically oriented text, what are the requirements? What about if you mix vertical text with scripts that are normally only horizontal? Do you need a switch to use different characters in vertical vs. horizontal text? Does the browser support short runs of horizontal text in vertical lines (tate-chu-yoko in Japanese) as expected? Is the orientation of characters and the directional ordering of characters supported as needed?</aside>
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<dlclass="reslinks">
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<dt>Requirements</dt>
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<dd>
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<ul>
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<li><cite>Arabic & Persian Layout Requirements</cite>: <atarget="_blank" href="https://www.w3.org/TR/alreq/#h_bidi_text">Bidirectional text</a></li>
<li><cite>Modern Standard Arabic Orthography Notes</cite>: <atarget="_blank" href="https://r12a.github.io/scripts/arab/arb.html#direction">Text direction</a></li>
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<li><cite><atarget="_blank" href="https://www.w3.org/TR/html-bidi/">Additional Requirements for Bidi in HTML & CSS</a></cite></li>
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<li><cite>Arabic & Persian Layout Requirements</cite>: <atarget="_blank" href="https://www.w3.org/TR/alreq/#h_writing_mode">Writing mode</a></li>
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</ul>
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</dd>
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<dt>GitHub discussions</dt>
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<dd>
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<ul>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aopen+is%3Aissue+label%3Aquestion+label%3As%3Aarab+label%3Ai%3Abidi_text">Open requests for information</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aopen+is%3Aissue+label%3Aquestion+label%3As%3Aarab+label%3Ai%3Awriting_mode">Open requests for information</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aissue+label%3As%3Aarab+label%3Ai%3Abidi_text">All Arabic script issues on this topic in the alreq repo</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aissue+label%3As%3Aarab+label%3Ai%3Awriting_mode">All Arabic script issues on this topic in the alreq repo</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/i18n-activity/issues?q=label%3Aalreq+label%3Ai%3Abidi_text">Arabic script issues in W3C specs</a></li>
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<li><aclass="variable empty" target="_blank" href="https://github.com/w3c/i18n-activity/issues?q=+is%3Aissue+label%3Aalreq+label%3Ai%3Avertical-text">Arabic script issues in W3C specs</a></li>
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</ul>
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</dd>
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<dt>Tests</dt>
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<dd>
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<ul>
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<li><atarget="_blank" href="https://www.w3.org/International/i18n-tests/results/int-bidi-text.html#arabic">Exploratory/interactive test results</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/text_direction_tests/issues?q=is%3Aissue++label%3As%3Aarab+label%3Ai%3Abidi_text">Exploratory/interactive test repo</a></li>
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<li><atarget="_blank" href="https://www.w3.org/International/i18n-tests/results/int-vertical-text.html#arabic">Exploratory/interactive test results</a></li>
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<li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dir-attribute">HTML5: dir basics</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dir-attribute-isolation">HTML5: dir isolation</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/bidi-text-rendering">HTML5: Bidirectional text rendering</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dir-attribute-auto">HTML5: dir=auto</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-bdo-element">HTML5: The bdo element</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dirname-attribute">HTML5: The dirname attribute</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/native-user-interfaces">HTML5: Native user interfaces</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/writing-modes-bidi">CSS Writing Modes: Bidi</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/text_direction_tests/issues?q=is%3Aissue++label%3As%3Aarab+label%3Ai%3AVertical_text">Exploratory/interactive test repo</a></li>
<asideclass="prompts">Are the script requirements for vertically oriented text met? What about if you mix vertical text with scripts that are normally only horizontal? Do you need a switch to use different characters in vertical vs. horizontal text? Does the browser support short runs of horizontal text in vertical lines (tate-chu-yoko in Japanese) as expected? Is the orientation of characters and the directional ordering of characters supported as needed?</aside>
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<asideclass="prompts">If the general inline direction is right-to-left, are there any issues when handling that? Where the inline direction of text is mixed, is this bidirectional text adequately supported? What about numbers and expressions? Do the Unicode bidi controls and HTML markup provide the support needed? Is isolation of directional runs problematic?</aside>
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<dlclass="reslinks">
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<dt>Requirements</dt>
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<dd>
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<ul>
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<li><cite>Arabic & Persian Layout Requirements</cite>: <atarget="_blank" href="https://www.w3.org/TR/alreq/#h_vertical_text">Vertical text</a></li>
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<li><cite>Arabic & Persian Layout Requirements</cite>: <atarget="_blank" href="https://www.w3.org/TR/alreq/#h_bidi_text">Bidirectional text</a></li>
<li><cite>Modern Standard Arabic Orthography Notes</cite>: <atarget="_blank" href="https://r12a.github.io/scripts/arab/arb.html#direction">Text direction</a></li>
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<li><cite><atarget="_blank" href="https://www.w3.org/TR/html-bidi/">Additional Requirements for Bidi in HTML & CSS</a></cite></li>
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</ul>
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</dd>
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<dt>GitHub discussions</dt>
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<dd>
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<ul>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aopen+is%3Aissue+label%3Aquestion+label%3As%3Aarab+label%3Ai%3Avertical_text">Open requests for information</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aopen+is%3Aissue+label%3Aquestion+label%3As%3Aarab+label%3Ai%3Abidi_text">Open requests for information</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aissue+label%3As%3Aarab+label%3Ai%3Avertical_text">All Arabic script issues on this topic in the alreq repo</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/alreq/issues?q=is%3Aissue+label%3As%3Aarab+label%3Ai%3Abidi_text">All Arabic script issues on this topic in the alreq repo</a></li>
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<li><aclass="variable empty" target="_blank" href="https://github.com/w3c/i18n-activity/issues?q=+is%3Aissue+label%3Aalreq+label%3Ai%3Avertical-text">Arabic script issues in W3C specs</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/i18n-activity/issues?q=label%3Aalreq+label%3Ai%3Abidi_text">Arabic script issues in W3C specs</a></li>
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</ul>
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</dd>
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<dt>Tests</dt>
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<dd>
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<ul>
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<li><atarget="_blank" href="https://www.w3.org/International/i18n-tests/results/int-vertical-text.html#arabic">Exploratory/interactive test results</a></li>
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<li><atarget="_blank" href="https://www.w3.org/International/i18n-tests/results/int-bidi-text.html#arabic">Exploratory/interactive test results</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/text_direction_tests/issues?q=is%3Aissue++label%3As%3Aarab+label%3Ai%3AVertical_text">Exploratory/interactive test repo</a></li>
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<li><atarget="_blank" href="https://github.com/w3c/text_direction_tests/issues?q=is%3Aissue++label%3As%3Aarab+label%3Ai%3Abidi_text">Exploratory/interactive test repo</a></li>
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<li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dir-attribute">HTML5: dir basics</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dir-attribute-isolation">HTML5: dir isolation</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/bidi-text-rendering">HTML5: Bidirectional text rendering</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dir-attribute-auto">HTML5: dir=auto</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-bdo-element">HTML5: The bdo element</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/the-dirname-attribute">HTML5: The dirname attribute</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/native-user-interfaces">HTML5: Native user interfaces</a></li><li><atarget="_blank" href="https://w3c.github.io/i18n-tests/results/writing-modes-bidi">CSS Writing Modes: Bidi</a></li>
<p>We need to clarify whether there is a particular requirement for handling arabic text specially in vertical lines, such as upright glyphs. We are also waiting on implementation of sideways values of writing-modes in order to be able to effectively use arabic text in vertical arrangements (such as book spines, table headings, etc), but that is not a problem specific to arabic.</p>
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