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[css-sizing] Import full propdef tables for all sizing properties, and import box-sizing. Fixes #1920 and fixes #1906.
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‎css-sizing-3/Overview.bs

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@@ -11,7 +11,7 @@ Editor: Tab Atkins, Google, http://xanthir.com/contact/, w3cid 42199
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Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
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Previous version: https://www.w3.org/TR/2016/WD-css-sizing-3-20160512/
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Abstract: This module extends the CSS sizing properties with keywords that represent content-based "intrinsic" sizes and context-based "extrinsic" sizes, allowing CSS to more easily describe boxes that fit their content or fit into a particular layout context.
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Ignored Terms: block-level box
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Ignored Terms: content box, border box, non-replaced
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</pre>
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<pre class='link-defaults'>
@@ -273,26 +273,99 @@ Intrinsic Size Constraints</h3>
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-->
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<h2 id='size-keywords'>
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New Sizing Keywords</h2>
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<h2 id="specifying-sizes" oldid='size-keywords'>
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Specifying Box Sizes</h2>
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<h3 id='width-height-keywords'>
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New Keywords for 'width' and 'height'</h3>
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<h3 id="sizing-properties">
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Sizing Properties: the 'width', 'height', 'min-width', 'min-height', 'max-width', and 'max-height' properties</h3>
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<pre class=propdef partial>
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Name: width, max-width, height, max-height
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New values: max-content | min-content | fit-content(<<length-percentage>>)
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This section defines the <dfn lt="sizing property">sizing properties</dfn>
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'width', 'height', 'min-width', 'min-height', 'max-width', and 'max-height'.
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Note: Additional <a>flow-relative</a> aliases to these properties are defined in [[CSS-LOGICAL-1]].
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<pre class=propdef>
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Name: width, height
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Value: auto | <<length-percentage>> | min-content | max-content | <nobr>fit-content(<<length-percentage>>)</nobr>
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Initial: auto
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Applies to: all elements except <a>non-replaced</a> <a>inlines</a>
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Inherited: no
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Percentages: relative to width/height of <a>containing block</a>
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Computed Value: as specified, with lengths made absolute
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Animatable: As <<length-percentage>>, or keyword, or as ''fit-content()'' with the <<length-percentage>> argument interpolable
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</pre>
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<pre class=propdef partial>
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The 'width' and 'height' properties specify
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the preferred (<a>physical</a>) <dfn>width</dfn> and <dfn>height</dfn> of the box, respectively.
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<pre class=propdef>
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Name: min-width, min-height
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New values: max-content | min-content
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Value: auto | <<length-percentage>> | min-content | max-content | <nobr>fit-content(<<length-percentage>>)</nobr>
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Initial: auto
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Applies to: all elements that accept 'width' or 'height'
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Inherited: no
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Percentages: relative to width/height of <a>containing block</a>
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Computed Value: as specified, with lengths made absolute
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Animatable: As <<length-percentage>>, or keyword, or as ''fit-content()'' with the <<length-percentage>> argument interpolable
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</pre>
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The 'min-width' and 'min-height' properties specify
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the <dfn lt="min width | minimum width | min size | minimum size">minimum width</dfn> (or “min width”)
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and <dfn lt="min height | minimum height">minimum height</dfn> (or “min height”)
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of the box, respectively.
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Note: The initial value of ''min-width/auto'' is new;
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in [[CSS2]] the initial value was zero.
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<pre class=propdef>
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Name: max-width, max-height
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Value: none | <<length-percentage>> | min-content | max-content | <nobr>fit-content(<<length-percentage>>)</nobr>
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Initial: none
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Applies to: all elements that accept 'width' or 'height'
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Inherited: no
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Percentages: relative to width/height of <a>containing block</a>
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Computed Value: as specified, with lengths made absolute
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Animatable: As <<length-percentage>>, or keyword, or as ''fit-content()'' with the <<length-percentage>> argument interpolable
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</pre>
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<p>These new values allow authors to explicitly request that a box
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take its intrinsic size:
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The 'max-width' and 'max-height' properties specify
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the <dfn lt="max width | maximum width | max size | maximum size">maximum width</dfn> (or “max width”)
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and <dfn lt="max height | maximum height">maximum height</dfn> (or “max height”)
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of the box, respectively.
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<h3 id="sizing-values" oldids='width-height-keywords'>
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Sizing Values: the <<length-percentage>>, ''width/auto'' | ''max-width/none'', ''width/min-content'', ''width/max-content'', and ''width/fit-content()'' values</h3>
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<dl dfn-type=value dfn-for="width, min-width, max-width, height, min-height, max-height">
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<dt><dfn><<length-percentage>></dfn>
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<dd>
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Specifies the size of the box using <<length>> and/or <<percentage>>.
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The 'box-sizing' property indicates whether the <a>content box</a> or <a>border box</a> is measured.
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Percentages are resolved against the width/height, as appropriate,
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of the box's <a>containing block</a>.
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If, in a particular axis,
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the <a>containing block’s</a> size depends on the box’s size,
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see the relevant layout module
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for special rules on how to resolve percentages.
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Negative values are invalid.
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<dt><dfn for="width, height, min-width, min-height">auto</dfn>
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<dd>
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For 'width'/'height', specifies an <dfn dfn for>automatic size</dfn>.
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See the relevant layout module for how to calculate this.
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For 'min-width'/'min-height',
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specifies an <dfn dfn for>automatic minimum size</dfn>.
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Unless otherwise defined by the relevant layout module,
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this computes to zero.
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<dt><dfn for="max-width, max-height">none</dfn>
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<dd>
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No limit on the size of the box.
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<!--
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<dt><dfn>stretch</dfn>
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<dd>
@@ -311,16 +384,16 @@ New Keywords for 'width' and 'height'</h3>
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like tables.
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-->
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<dt><dfn>max-content</dfn>
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<dt><dfn>min-content</dfn>
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<dd>
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If specified for the inline axis,
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use the <a>max-content inline size</a>;
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use the <a>min-content inline size</a>;
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otherwise compute to the property’s <a>initial value</a>.
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<dt><dfn>min-content</dfn>
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<dt><dfn>max-content</dfn>
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<dd>
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If specified for the inline axis,
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use the <a>min-content inline size</a>;
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use the <a>max-content inline size</a>;
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otherwise compute to the property’s <a>initial value</a>.
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<!--
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<dt><dfn>fit-content</dfn>
@@ -339,8 +412,19 @@ New Keywords for 'width' and 'height'</h3>
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i.e.
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<code>min(''width/max-content'', max(''width/min-content'', <<length-percentage>>))</code>;
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otherwise compute to the property’s <a>initial value</a>.
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Negative values are invalid.
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</dl>
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In all cases,
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the used value is floored to preserve a non-negative <a>inner size</a>.
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Note: The ''width/min-content'', ''width/max-content'', and ''width/fit-content()'' values
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are new in Level 3.
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Note: The 'flex-basis' property hereby also gains these new keywords,
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as its values are defined by reference to <'width'>.
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Note: This section previously defined ''width/stretch'' and ''width/fit-content''
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as keywords representing the <a>stretch-fit size</a> and <a>fit-content size</a>,
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respectively.
@@ -351,9 +435,6 @@ New Keywords for 'width' and 'height'</h3>
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to better work out the implications in situations with
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<a>indefinite</a> <a>available space</a>.
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Note: The 'flex-basis' property hereby also gains these new keywords,
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as its values are defined by reference to <'width'>.
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<h4 id="behave-auto">
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“Behaving as ''width/auto''”</h4>
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these should be interpreted as meaning <a>behaves as auto</a>,
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and reported to the CSSWG for updating.
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ISSUE: Replace this section with references to the new term <a>automatic size</a>.
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<h4 id='the-contain-floats-value'>
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Containing or Excluding Floats</h4>
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Note: Boxes participating in Flex, Grid, or Table layout will automatically have this behavior.
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-->
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<h3 id="box-sizing">
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Inner vs Outer Sizes: the 'box-sizing' property</h3>
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<pre class="propdef">
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Name: box-sizing
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Value: content-box | border-box
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Initial: content-box
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Applies to: all elements that accept 'width' or 'height'
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Inherited: no
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Percentages: N/A
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Animation type: discrete
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</pre>
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The 'box-sizing' property switches the box model
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between asssigning finite sizes such as <<length>>s and <<percentage>>s
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to either the <a>content box</a> or <a>border box</a>.
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It affects the interpretation of all <a>sizing properties</a>,
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including 'flex-basis'.
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Values have the following meanings:
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<dl dfn-type=value dfn-for=box-sizing>
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<dt><dfn>content-box</dfn>
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<dd>
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Sizes specified on <a>sizing properties</a>
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as <<length-percentage>>
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represent <a>inner sizes</a>:
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they are applied to the <a>content box</a>.
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The padding and border of the box
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are laid out and drawn <em>outside</em> the specified 'width' and 'height'.
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Note: This is the behavior of width and height as specified by CSS2.1,
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and is thus the default.
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<dt><dfn>border-box</dfn>
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<dd>
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Sizes specified on <a>sizing properties</a>
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as <<length-percentage>>
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represent <a>outer sizes</a>:
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they are applied to the <a>border box</a>.
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The padding and border of the box
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are laid out and drawn <em>inside</em> the specified 'width' and 'height',
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with the <a>content box</a> sized to fill the remaining space,
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floored at zero.
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The content width and height are calculated
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by subtracting the border and padding widths of the respective sides
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from the specified <<length-percentage>>.
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As the content width and height
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[[#sizing-values|cannot be negative]],
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this computation is floored at zero.
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Used values, as exposed for instance through {{getComputedStyle()}},
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also refer to the border box.
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</dl>
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Values affected by 'box-sizing' include
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both raw <<length-percentage>> values
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and those used in functional notations such as ''width/fit-content()''.
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In contrast,
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non-quantitative values such as ''width/auto'' and ''width/min-content''
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are not influenced by the 'box-sizing' property
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(unless otherwise specified).
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<div class=example>
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For example, the following properties set the <a>inner size</a> of the box to ''100px'',
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and the <a>outer size</a> to ''120px'':
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<pre class=lang-css>
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.box {
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box-sizing: content-box; /* default */
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width: 100px;
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padding-left: 10px;
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border-left: 10px solid;
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}
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</pre>
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On the other hand, by changing to ''border-box'',
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the <a>inner size</a> is now ''80px'',
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while the <a>outer size</a> is ''100px'':
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<pre class=lang-css>
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.box {
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box-sizing: border-box;
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width: 100px;
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padding-left: 10px;
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border-left: 10px solid;
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}
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</pre>
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The <a>inner size</a> can't be less than zero,
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so if the 'padding' + 'border' is greater than the specified <a>outer size</a>,
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the box will end up larger than specified.
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In this case, the <a>inner size</a> will be ''0px''
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while the <a>outer size</a> is ''120px'',
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even though ''width: 100px'' is specified:
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<pre class=lang-css>
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.box {
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box-sizing: border-box;
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width: 100px;
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padding-left: 60px;
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border-left: 60px solid;
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/* padding + border = 120px */
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}
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</pre>
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</div>
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Note: Certain HTML elements,
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such as <{button}>,
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default to ''border-box'' behavior.
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See HTML for details on which elements have this behavior.
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In the CSS specifications,
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the terms <a>width</a>, <a>height</a>,
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<a lt="min width">minimum (min) width</a>,
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<a lt="min height">minimum (min) height</a>,
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<a lt="max width">maximum (max) width</a>, and
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<a lt="max height">maximum (max) height</a>
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refer to the <a lt="inner size">inner</a> (<a>content box</a>) size
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unless otherwise specified.
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<!--
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-->
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<h3 id='column-sizing'>
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Column Sizing Keywords</h3>
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New Column Sizing Values: the ''column-width/min-content'', ''column-width/max-content'', and ''column-width/fit-content()'' values</h3>
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<pre class="propdef partial">
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Name: column-width
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New values: max-content | min-content | fit-content(<<length-percentage>>)
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New values: min-content | max-content | fit-content(<<length-percentage>>)
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</pre>
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<p>When used as values for 'column-width',
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<dd>Specifies the optimal column width as the <a>stretch-fit inline size</a>
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of the multi-column element.
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-->
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<dt><dfn>max-content</dfn>
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<dd>Specifies the optimal column width as the <a>max-content inline size</a>
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of the multi-column element's contents.
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<dt><dfn>min-content</dfn>
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<dd>Specifies the optimal column width as the <a>min-content inline size</a>
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of the multi-column element's contents.
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<dt><dfn>max-content</dfn>
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<dd>Specifies the optimal column width as the <a>max-content inline size</a>
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of the multi-column element's contents.
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<!--
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<dt><dfn>fit-content</dfn>
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<dd>Specifies the optimal column width as

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