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Hide extra markers displayed in `Safari`. #265

Job	Run time
Fast test	1m 27s
Test main target	1m 52s
Test all other targets (ubuntu-20.04, beta, false)	1m 13s
Test all other targets (ubuntu-20.04, 1.76.0, false)	1m 10s
Test all other targets (ubuntu-20.04, nightly, true)	1m 10s
Test all other targets (windows-2022, stable, false)	2m 15s
	9m 7s

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