Jonathan Chan 18dbfced52 Correctly test CSSStyleRule.style. ...

Remove the assert_readonly test and add one to verify that assigning to
CSSStyleRule.style correctly forwards to CSSStyleRule.style.cssText.

We currently test for whether CSSStyleRule.style is read-only by
trying to assign to it; however, the spec has it as actually:

interface CSSStyleRule : CSSRule {
  ...
  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
};

See: https://drafts.csswg.org/cssom/

The `PutForwards=cssText` means that assigning to CSSStyleRule.style
should actually assign to style.cssText.

2017-06-12 15:51:58 -07:00

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