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[css-fonts-5] Add vertical metrics overrides. #6152 #6381

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Merged
svgeesus merged 1 commit into from
Jun 17, 2021
Merged

[css-fonts-5] Add vertical metrics overrides. #6152 #6381

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28 changes: 21 additions & 7 deletions css-fonts-5/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -184,21 +184,21 @@ the 'ascent-override', 'descent-override', and 'line-gap-override' descriptors</

<pre class='descdef'>
Name: ascent-override
Value: normal | <<percentage [0,Infinity]>>
Value: [ normal | <<percentage [0,Infinity]>> ]{1,2}
For: @font-face
Initial: normal
</pre>

<pre class='descdef'>
Name: descent-override
Value: normal | <<percentage [0,Infinity]>>
Value: [ normal | <<percentage [0,Infinity]>> ]{1,2}
For: @font-face
Initial: normal
</pre>

<pre class='descdef'>
Name: line-gap-override
Value: normal | <<percentage [0,Infinity]>>
Value: [ normal | <<percentage [0,Infinity]>> ]{1,2}
For: @font-face
Initial: normal
</pre>
Expand All @@ -208,6 +208,9 @@ the 'ascent-override', 'descent-override', and 'line-gap-override' descriptors</
<a spec="CSS-INLINE-3">descent metric</a>, and
<a spec="CSS-INLINE-3">line gap metric</a>
of the font, respectively.
The first value provides the value for the x axis,
and the second value provides the value for the y axis
(defaulting to ''ascent-override/normal'' if omitted).

<dl dfn-for="ascent-override!!descriptor,descent-override!!descriptor,line-gap-override!!descriptor" dfn-type=value>
<dt><dfn>normal</dfn>
Expand All @@ -234,6 +237,10 @@ the 'ascent-override', 'descent-override', and 'line-gap-override' descriptors</
They can, however, affect the behavior of ''line-height: normal''
and more generally the baseline alignment of [=inline-level=] content.

Note: Since these metrics are only applicable in the [=block axis=],
the y-axis value will only be used
when [=typesetting upright=] in vertical [=typographic modes=].

<div class="example">
The percentage is resolved against different font sizes for different elements.

Expand Down Expand Up @@ -290,28 +297,28 @@ the 'superscript-position-override', 'subscript-position-override','superscript-

<pre class='descdef'>
Name: superscript-position-override
Value: normal | from-font | <<percentage>>
Value: [ normal | from-font | <<percentage>> ]{1,2}
For: @font-face
Initial: normal
</pre>

<pre class='descdef'>
Name: subscript-position-override
Value: normal | from-font | <<percentage>>
Value: [ normal | from-font | <<percentage>> ]{1,2}
For: @font-face
Initial: normal
</pre>

<pre class='descdef'>
Name: superscript-size-override
Value: normal | from-font | <<percentage [0,Infinity]>>
Value: [ normal | from-font | <<percentage [0,Infinity]>> ]{1,2}
For: @font-face
Initial: normal
</pre>

<pre class='descdef'>
Name: subscript-size-override
Value: normal | from-font | <<percentage [0,Infinity]>>
Value: [ normal | from-font | <<percentage [0,Infinity]>> ]{1,2}
For: @font-face
Initial: normal
</pre>
Expand All @@ -321,6 +328,9 @@ the 'superscript-position-override', 'subscript-position-override','superscript-
specify the superscript offset, subscript offset, superscript size, and subscript size
metrics of the font, respectively,
which are used to synthesize glyphs when required by 'font-variant-position'.
The first value provides the value for the x axis,
and the second value provides the value for the y axis
(defaulting to the first value if omitted).

<dl dfn-for="superscript-position-override!!descriptor,subscript-position-override!!descriptor,superscript-size-override!!descriptor,subscript-size-override!!descriptor" dfn-type=value>
<dt><dfn>normal</dfn>
Expand All @@ -339,6 +349,10 @@ the 'superscript-position-override', 'subscript-position-override','superscript-
the given percentage multiplied by the used font size.
</dl>

Note: Since these metrics are only applicable in the [=block axis=],
the y-axis value will only be used
when [=typesetting upright=] in [=vertical typographic modes=].

<h2 id="font-rend-props">
Font Feature Properties</h2>

Expand Down