Bug 258916

Summary:	Avoid unnecessary tree traversal in customElements.define
Product:	WebKit	Reporter:	Ryosuke Niwa <rniwa>
Component:	DOM	Assignee:	Ryosuke Niwa <rniwa>
Status:	RESOLVED WONTFIX
Severity:	Normal
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Ryosuke Niwa 2023-07-06 02:50:20 PDT

customElements.define currently always traverses the entire document to find upgrade candidates.
Avoid this traversal whenever possible by keeping track of the number of upgrade candidates.

Comment 1 Ryosuke Niwa 2023-07-06 03:14:26 PDT

Pull request: https://github.com/WebKit/WebKit/pull/15592