1425678 - CSSStyleDeclaration.hasOwnProperty("color") returns a different value than Blink / WebKit.

Status: RESOLVED INVALID

(Core :: DOM: CSS Object Model, defect)

Description

[Emilio Cobos Álvarez (:emilio)]

And that makes tests like:

 https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/css-grid/grid-layout-properties.html

Fail early, instead of catching bug 1425227.

Comment 1

[Emilio Cobos Álvarez (:emilio)]

Cameron, you know way better WebIDL than I, do you know what's supposed to happen here? Is this our bug or a Blink / WebKit bug?

Comment 2

[Emilio Cobos Álvarez (:emilio)]

For the record, a simple STR is:

  document.body.style.hasOwnProperty("color")

In any web page.

Comment 3

[Cameron McCormack (:heycam)]

false is the correct result per spec, since CSSOM defines CSSStyleDeclaration to have IDL attributes corresponding to every property, e.g.

  interface CSSStyleDeclaration {
    attribute CSSOMString color;
    ...
  };

and IDL attributes are exposed as access properties on CSSStyleDeclaration.prototype, not on style declaration objects themselves.

Comment 4

[Cameron McCormack (:heycam)]

*accessor properties

Comment 5

[Boris Zbarsky [:bzbarsky]]

Blink/Webkit are known buggy here.  The test is buggy as well, if it depends on their behavior.  See https://bugs.chromium.org/p/chromium/issues/detail?id=700338 for the Blink bug tracking this; that also includes a link to the spec discussion.  I don't know what WebKit's status is in terms of bugs filed.

Comment 6

[Emilio Cobos Álvarez (:emilio)]

That is... Unfortunate. I'll fix the test in bug 1425227.