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Clarify that attribution rectangles use CSS pixels #125

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Clarify that attribution rectangles use CSS pixels #125

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10 changes: 8 additions & 2 deletions index.bs
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Expand Up @@ -466,6 +466,12 @@ contexts. This allows developers to detect support for the Layout Instability AP
};
</pre>

NOTE: The {{LayoutShiftAttribution/previousRect}} and {{LayoutShiftAttribution/currentRect}}
attributes report rectangles in <a>CSS pixels</a>, consistent with other Web Platform APIs
such as {{Element/getBoundingClientRect()}}, {{IntersectionObserver}}, and {{ResizeObserver}}.
This provides a device-independent coordinate system that simplifies correlation of layout
shift measurements with other DOM measurements.

Each {{LayoutShiftAttribution}} is associated with a {{Node}} (its
<dfn>associated node</dfn>).

Expand Down Expand Up @@ -582,10 +588,10 @@ run the following steps:
1. Set the <a>associated node</a> of |A| to |N|.
1. Set the <dfn attribute for=LayoutShiftAttribution>previousRect</dfn> attribute
of |A| to the smallest <a>Rectangle</a> containing the <a>previous frame visual
representation</a> of |N|.
representation</a> of |N|, in <a>CSS pixels</a>.
1. Set the <dfn attribute for=LayoutShiftAttribution>currentRect</dfn> attribute
of |A| to the smallest <a>Rectangle</a> containing the <a>visual
representation</a> of |N|.
representation</a> of |N|, in <a>CSS pixels</a>.
1. Return |A|.

</div>
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