2016071 - Make location.ancestorOrigins cache lists

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, defect)

Description

[Simon Farre [:sfarre]]

Spec is reworked to try to return the same object as much as possible: https://github.com/whatwg/html/pull/12071

Implementation should be something like:

• Stash an empty list on a Location/LocationBase
• Stash the relevant doc's DOMStringList on the Document

Webcompat story:
Chrome returns a new object every time
Webkit caches the object.

Comment 1

[Simon Farre [:sfarre]]

Attachment: Bug 2016071 - Return cached same-object ancestorOrigins list when possible r=#dom-core!

Caches an empty list on Location for when relevant doc is null, and
caches the DOMStringList on Document when the user has called it. Which
moves us closer to spec.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/40f54ac94572
https://hg.mozilla.org/integration/autoland/rev/235c31a3441a
Return cached same-object ancestorOrigins list when possible r=dom-core,smaug

Comment 3

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/235c31a3441a