Bug 194327 – Inline style incorrectly does reads and writes properties on Object.prototype

• Component: Bindings
• Status: NEW

[Elliott Sprehn]

ex.

Object.prototype.color = "wtf";

makes every style object in the entire document report "wtf" for the color property.

document.createElement("div").style.color == "wtf"

Also doing element.style.color = 'anything' will then set a data property on the instance but not update the actual style.

Per https://drafts.csswg.org/cssom/#the-cssstyledeclaration-interface

I think webkit should probably make these getters and setters instead of data properties:

"""
For each CSS property property that is a supported CSS property, the following partial interface applies where camel-cased attribute is obtained by running the CSS property to IDL attribute algorithm for property.

partial interface CSSStyleDeclaration {
  [CEReactions] attribute [TreatNullAs=EmptyString] CSSOMString _camel_cased_attribute;
};

For each CSS property property that is a supported CSS property, except for properties that have no "-" (U+002D) in the property name, the following partial interface applies where dashed attribute is property.

partial interface CSSStyleDeclaration {
  [CEReactions] attribute [TreatNullAs=EmptyString] CSSOMString _dashed_attribute;
};
"""

Firefox does currently follow this spec, though Chrome does not:

Object.getOwnPropertyDescriptor(document.body.style.__proto__, 'paddingTop') // getter/setter in Firefox, doesn't exist in Chrome and Safari.
Object.getOwnPropertyDescriptor(document.body.style.__proto__, 'padding-top') // getter/setter in Firefox, doesn't exist in Chrome and Safari.
Object.getOwnPropertyDescriptor(document.body.style, 'padding-top') // data property in Chrome and Safari, doesn't exist in Firefox.
Object.getOwnPropertyDescriptor(document.body.style, 'paddingTop') // data property in Chrome and Safari, doesn't exist in Firefox.

[Emilio Cobos Álvarez (:emilio)]

*** Bug 197991 has been marked as a duplicate of this bug. ***

[Radar WebKit Bug Importer]

<rdar://problem/51032524>