w3c/csswg-drafts

[cssom-view] Expose inner border dimensions

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#1,129 建立於 2017年3月27日

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描述

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.

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css
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研究方向
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.