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Equivalent to <aclass="css" data-link-type="maybe" href="#valdef-dominant-baseline-alphabetic">alphabetic</a> in <i>horizontal writing modes</i>
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and in <i>vertical writing modes</i>
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when <aclass="property" data-link-type="propdesc">text-orientation</a> is <spanclass="css">sideways</span>, <spanclass="css">sideways-right</span>, or <spanclass="css">sideways-left</span>.
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when <aclass="property" data-link-type="propdesc"href="https://drafts.csswg.org/css-writing-modes-3/#propdef-text-orientation">text-orientation</a> is <aclass="css"data-link-type="maybe" href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-sideways">sideways</a>, <aclass="css"data-link-type="maybe" href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-sideways-right">sideways-right</a>, or <aclass="css"data-link-type="maybe" href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-sideways-left">sideways-left</a>.
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equivalent to <aclass="css" data-link-type="maybe" href="#valdef-dominant-baseline-central">central</a> in <i>vertical writing modes</i>
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when <aclass="property" data-link-type="propdesc">text-orientation</a> is <spanclass="css">mixed</span> or <spanclass="css">upright</span>.
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when <aclass="property" data-link-type="propdesc"href="https://drafts.csswg.org/css-writing-modes-3/#propdef-text-orientation">text-orientation</a> is <aclass="css"data-link-type="maybe" href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-mixed">mixed</a> or <aclass="css"data-link-type="maybe" href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-upright">upright</a>.
<p>The alignment constraints for drop initials depend on the writing system. In ideographic scripts, the initial letter extends from the <adata-link-type="dfn">block-start</a> edge of the first line to the <adata-link-type="dfn">block-end</a> edge of the Nth line.</p>
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<p>The alignment constraints for drop initials depend on the writing system. In ideographic scripts, the initial letter extends from the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#block-start">block-start</a> edge of the first line to the <adata-link-type="dfn" href="https://drafts.csswg.org/css-writing-modes-3/#block-end">block-end</a> edge of the Nth line.</p>
<dd>Uses the <adata-link-type="dfn">line-over</a> and <adata-link-type="dfn">line-under</a> margin edges
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as the <adata-link-type="dfn">over</a> and <adata-link-type="dfn">under</a> alignment points, respectively.
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<dd>Uses the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#line-over">line-over</a> and <adata-link-type="dfn" href="https://drafts.csswg.org/css-writing-modes-3/#line-under">line-under</a> margin edges
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as the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#over">over</a> and <adata-link-type="dfn" href="https://drafts.csswg.org/css-writing-modes-3/#under">under</a> alignment points, respectively.
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<dt>content-box
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<dd>Uses the <adata-link-type="dfn">line-over</a> and <adata-link-type="dfn">line-under</a> content edges
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as the <adata-link-type="dfn">over</a> and <adata-link-type="dfn">under</a> alignment points, respectively.
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<dd>Uses the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#line-over">line-over</a> and <adata-link-type="dfn" href="https://drafts.csswg.org/css-writing-modes-3/#line-under">line-under</a> content edges
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as the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#over">over</a> and <adata-link-type="dfn" href="https://drafts.csswg.org/css-writing-modes-3/#under">under</a> alignment points, respectively.
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(In most cases, these will correspond to
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the <adata-link-type="dfn">over</a> and <adata-link-type="dfn">under</a> edges of the glyph bounding box.)
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the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#over">over</a> and <adata-link-type="dfn" href="https://drafts.csswg.org/css-writing-modes-3/#under">under</a> edges of the glyph bounding box.)
Positioning and Kerning Initial Letters</span><aclass="self-link" href="#initial-letter-position"></a></h3>
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<p>In the <adata-link-type="dfn">block axis</a>, the <adata-link-type="dfn" href="#initial-letter">initial letter</a> is positioned to satisfy its alignment requirements. (See <aclass="property" data-link-type="propdesc" href="#propdef-initial-letter-align">initial-letter-align</a>.)</p>
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<p>In the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#block-axis">block axis</a>, the <adata-link-type="dfn" href="#initial-letter">initial letter</a> is positioned to satisfy its alignment requirements. (See <aclass="property" data-link-type="propdesc" href="#propdef-initial-letter-align">initial-letter-align</a>.)</p>
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<p>In the <adata-link-type="dfn">inline axis</a>, the position of the inline letter is given by aligning its start margin edge to the start edge of the containing block.</p>
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<p>In the <adata-link-type="dfn"href="https://drafts.csswg.org/css-writing-modes-3/#inline-axis">inline axis</a>, the position of the inline letter is given by aligning its start margin edge to the start edge of the containing block.</p>
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<p>However, if the <adata-link-type="dfn" href="#initial-letter">initial letter</a> is a non-atomic inline with zero padding and borders, the UA must apply an additional negative offset on the start side of the amount necessary to optically align the first glyph to the containing block edge as it would be in normal text.</p>
<dd>Elika Etemad; Koji Ishii. <ahref="http://www.w3.org/TR/css-text-3/">CSS Text Module Level 3</a>. 10 October 2013. LCWD. URL: <ahref="http://www.w3.org/TR/css-text-3/">http://www.w3.org/TR/css-text-3/</a>
<dd>S. Bradner. <ahref="https://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>. March 1997. Best Current Practice. URL: <ahref="https://tools.ietf.org/html/rfc2119">https://tools.ietf.org/html/rfc2119</a>
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