Andreas Kling 39389b5704 LibWeb: Don't make deep copy of custom properties for every element ...

Previously we were making a copy of the full set of custom properties
that applied to a DOM element. This was very costly and dominated the
profile when mousing around on GitHub.

Note that this may break custom properties on pseudo elements a little
bit, and that's something we'll have to look into.

2022-03-13 18:09:43 +01:00

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