[cssom-view] elementFromPoint etc need to be defined in terms of layout and visual viewports · w3c/csswg-drafts#1378

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説明

https://www.w3.org/TR/cssom-view-1/#dom-document-elementfrompoint

elementFromPoint(), elementsFromPoint() and caretPositionFromPoint() need to define whether the arguments are relative to the layout or visual viewports. Other "client" coordinates are being defined as being in terms of the layout viewport (e.g. getBoundingClientRects(), getClientRects(), event.clientX/y [citation needed]).

The spec also needs to define whether the clipping to the the viewport uses the layout or visual viewports for clipping.

コントリビューターガイド

技術スタック: htmlcss
領域: documentation
Issue 種別: documentation
難度: 4
推定時間: half day
活動状況: stale
明確さ: mostly clear
前提条件: CSSOM View specificationunderstanding of layout and visual viewports
初心者向け度: 30
調査方針: Review the CSSOM View specification sections on elementFromPoint, elementsFromPoint, and caretPositionFromPoint. Examine existing comments in the issue for proposed definitions. Consider how other 'client' coordinates are defined in terms of layout viewport. Propose text that clarifies whether arguments are relative to layout or visual viewports and whether clipping uses layout or visual viewports.