Bug 152454 – Object.keys returns length property of some DOM Objects

• Status: RESOLVED
• Resolution: CONFIGURATION CHANGED
• Component: JavaScriptCore

[Felquis]

Hello

Object.keys(document.styleSheets) returns ['0', 'length'] while other browsers returns ['0']..

Object.keys(document.querySelectorAll('div')) also returns the 'length' as a key.. but in Chrome, Firefox and Opera does not. So I think it is a Safari issue.

Tested into Version 9.0.2 (10601.3.9), may affect iOS and probably affect others DOM Object TokenLists and Collections, for example HTMLCollection `Object.keys(document.body.children)` also returns the length property...

It is breaking my code here https://github.com/felquis/CSSOM-Query/issues/1

Thanks..

[Ahmad Saleem]

I am able to reproduce this issue while running these two in console on this page in Safari 15.6 on macOS 12.5 and other browsers:

*** Safari 15.6 on macOS 12.5 ***

For Object.keys(document.styleSheets); - it returns ["0", "1", "2"] (3)

For Object.keys(document.querySelectorAll('div')); - it returns ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", …] (38) 

*** Firefox Nightly 105 & Chrome Canary 106 ***

For first - (2) ['0', '1']

For second - (16) ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15']

____

If I am testing wrong then please ignore me but just wanted to share updated results. Thanks!

[Ryosuke Niwa]

Not reproducing this anymore. We likely fixed it in recent bindings improvements.