Pete Bacon Darwin 234b5edcc7 fix(platform-browser): in Meta.addTag() do not add duplicate meta tags (#42703)
Previously, if there were two tags with the same "name" or "property" attribute selector,
then only the first was checked for duplicates when deciding whether to add a new meta
tag.

Fixes #42700
Fixes #19606

PR Close #42703
2021-06-30 10:35:30 -07:00
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