Fix cssesc from breaking browser code #23166

Job	Run time
Build: ubuntu-latest	1m 3s
Build: windows-latest	1m 13s
Test (Smoke): ubuntu-latest (node@18)	5m 17s
Test (E2E): ubuntu-latest (node@18.17.1)	4m 31s
Lint	1m 9s
Test (E2E): windows-latest (node@18.17.1)	7m 26s
Test: ubuntu-latest (node@18)	6m 26s
Test (Smoke): windows-latest (node@18)	7m 39s
Test: ubuntu-latest (node@20.5.1)	7m 2s
Test: macos-14 (node@18)	5m 58s
Test: windows-latest (node@18.17.1)	9m 3s
	56m 47s

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