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Define root element (as a term, and its display type) #8095

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Dec 7, 2022
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Define root element (as a term, and its display type) #8095

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22 changes: 19 additions & 3 deletions css-display-3/Overview.bs
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Expand Up @@ -861,7 +861,13 @@ Automatic Box Type Transformations</h3>
</ul>
</div>

The root element’s display type is always <a>blockified</a>.
<h3 id='root'>
The Root Element’s Principal Box</h3>

The [=root element=]’s display type is always <a>blockified</a>,
and its [=principal box=] always establishes an [=independent formatting context=].
This box’s [=containing block=] is the [=initial containing block=].

Additionally, a 'display' of ''display/contents'' computes to ''block'' on the root element.

<!--
Expand Down Expand Up @@ -1384,6 +1390,14 @@ Appendix A: Glossary</h2>
The following terms are defined here for convenience:

<dl export>
<dt><dfn>root element</dfn>
<dd>
The [=CSS/element=] at the root of the [=document tree=].
In a [=document tree=] produced under the DOM,
this is the [=document element=];
in HTML it is the <{html}> element.
[[DOM]] [[HTML]]

<dt><dfn>principal box</dfn>
<dd>
When an [=CSS/element=] generates one or more [=boxes=],
Expand Down Expand Up @@ -1547,9 +1561,11 @@ Appendix A: Glossary</h2>

<dt><dfn>initial containing block</dfn>
<dd>
The <a>containing block</a> of the root element.
The <a>containing block</a> of the [=root element=].
The [=initial containing block=] establishes a [=block formatting context=].
See <a href="https://www.w3.org/TR/CSS2/visudet.html#containing-block-details">CSS2.1&sect;10.1</a> for [=continuous media=];
and [[!CSS-PAGE-3]] for [=paged media=].
and [[!CSS-PAGE-3]] for [=paged media=]
for its position and dimensions.

<dt><dfn>formatting context</dfn>
<dd>
Expand Down