Much like bug 87129, this is something that exists for the Web Inspector.
<rdar://problem/70447880>
I can only find these references: https://github.com/WebKit/WebKit/blob/8afe31a018b11741abdf9b4d5bb973d7c1d9ff05/Source/WebCore/css/CSSStyleDeclaration.h#L57 https://github.com/WebKit/WebKit/blob/8afe31a018b11741abdf9b4d5bb973d7c1d9ff05/Source/WebKit/WebProcess/InjectedBundle/API/gtk/DOM/WebKitDOMCSSStyleDeclaration.cpp#L262 There are two more references in Webkit Legacy but just wanted to post above above two. Thanks!
Pull request: https://github.com/WebKit/WebKit/pull/6454
Committed 256633@main (d20f6c029526): <https://commits.webkit.org/256633@main> Reviewed commits have been landed. Closing PR #6454 and removing active labels.
There was a regression here: https://gitlab.gnome.org/GNOME/epiphany/-/issues/1917 But I don't think the call was actually necessary, so I'll just remove it.