Re: [cssom-view] More getBoxQuads/convert*FromNode issues

On Sep 20, 2013, at 7:57 AM, "Robert O'Callahan" <robert@ocallahan.org<mailto:robert@ocallahan.org>> wrote:

What should getBoxQuads() on a table element return? Obvious options:
1) a quad for the "inner table box" (the box with the rows and columns, which has the table border on it)
2) a quad for the "outer table box" (the box enclosing the inner table box and any caption box, which has the table margins on it)
3) a quad for the "inner table box" and a quad for the caption box

For the analogous question with getClientRects(), Gecko currently does #3, which is explicitly mandated as a special case in the CSSOM Views spec:
http://dev.w3.org/csswg/cssom-view/#dom-element-getclientrects

I think the rationale is that we want getBoundingClientRect() on a table to include the caption area, but option #2 (which is what Chrome getClientRects() does) doesn't match the box where the border is drawn and doesn't give you a way to get the inner table box geometry).

In a way, the most logical thing to do for getBoxQuads would be to use the inner table box for "content", "padding" and "border" boxes and use the outer table box for "margin" boxes and ignore the caption altogether, but that could still confuse authors. I'm not sure what to do, other than curse tables.

Smaller issues: Should DOMPoint/DOMRect/DOMQuad constructors/attributes allow unrestricted doubles? I think probably not.

To support unrestricted double was an explicit request for DOMMatrix from some implementers. I don't really like it, but don't we want to be consistent across all geometric objects?

Dirk


What about list bullets: should they contribute quads to getQuadList? I think anonymous decorations like list bullets probably should not.

Rob
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