w3c/csswg-drafts

[cssom-view] Expose inner border dimensions

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#1,129 opened on 2017年3月27日

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説明

cf. https://github.com/jquery/jquery/issues/3589#issuecomment-289548410

There seems to be no good method for calculating the dimensions of an element's inner border edge (i.e., content area plus padding plus non-floating scrollbars). One can subtract computed border dimensions from offsetWidth or offsetHeight in the special case of a block-layout HTMLElement, but as far as I can tell it's otherwise impossible.

I think the Element interface should expose something for such calculations, e.g.

  • scrollGutterWidth/scrollGutterHeight (the space lost to scrollbars), or
  • scrollbarWidth/scrollbarHeight (the scrollbar width), along with a method for identifying non-floating scrollbars, or
  • fullClientWidth/fullClientHeight (the dimensions of an inner border edge).

The last one seems most consistent with the rest of CSSOM View.

コントリビューターガイド

技術スタック
css
領域
frontenddocumentation
Issue 種別
feature
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
5
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
over 1 week
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
なし
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
10
調査方針
This issue proposes adding a method to expose inner border dimensions (content + padding + scrollbars) to the CSSOM View specification. First, review the CSSOM View spec and the referenced jQuery issue to understand the current limitations. Then, consider the proposed approaches (scrollGutterWidth, scrollbarWidth, or fullClientWidth) and evaluate which fits best with existing APIs. Discuss in the issue and potentially draft a concrete proposal for the spec.