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[cssom-view] Add a "get the bounding box" algorithm for getBoundingClientRect() #5614 #7446

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Jul 5, 2022
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[cssom-view] Add a "get the bounding box" algorithm for getBoundingClientRect() #5614 #7446

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24 changes: 15 additions & 9 deletions cssom-view-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1057,16 +1057,22 @@ The <dfn method for=Element>getClientRects()</dfn> method, when invoked, must re

Note: The {{DOMRect}} objects returned by {{Element/getClientRects()}} are not <a spec=html>live</a>.

The <dfn method for=Element caniuse=getboundingclientrect>getBoundingClientRect()</dfn> method, when invoked, must return the result of the following
algorithm:
The <dfn method for=Element caniuse=getboundingclientrect>getBoundingClientRect()</dfn> method, when
invoked on an element <var>element</var>, must return the result of
<a>getting the bounding box</a> for <var>element</var>.

1. Let <var>list</var> be the result of invoking {{Element/getClientRects()}} on the same element this method was invoked on.
1. If the <var>list</var> is empty return a {{DOMRect}} object
whose {{DOMRect/x}}, {{DOMRect/y}}, {{DOMRect/width}} and {{DOMRect/height}} members are zero.
1. If all rectangles in <var>list</var> have zero width or height, return the first rectangle in
<var>list</var>.
1. Otherwise, return a {{DOMRect}} object describing the smallest rectangle that includes all
of the rectangles in <var>list</var> of which the height or width is not zero.
<div algorithm>
To <dfn export for=Element>get the bounding box</dfn> for <var>element</var>,
run the following steps:
1. Let <var>list</var> be the result of invoking {{Element/getClientRects()}} on
<var>element</var>.
1. If the <var>list</var> is empty return a {{DOMRect}} object whose {{DOMRect/x}},
{{DOMRect/y}}, {{DOMRect/width}} and {{DOMRect/height}} members are zero.
1. If all rectangles in <var>list</var> have zero width or height, return the first rectangle in
<var>list</var>.
1. Otherwise, return a {{DOMRect}} object describing the smallest rectangle that includes all
of the rectangles in <var>list</var> of which the height or width is not zero.
</div>

Note: The {{DOMRect}} object returned by {{Element/getBoundingClientRect()}} is not <a spec=html>live</a>.

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