Add overlay UI element #1629

Job	Run time
check_release	7m 24s
JS (ubuntu-latest, chrome-headless)	3m 42s
build	8m 46s
check_links	2m 33s
JS (ubuntu-latest, firefox-headless)	4m 9s
JS (windows-latest, chrome-headless)	7m 32s
JS (windows-latest, firefox-headless)	9m 4s
JS (windows-latest, webkit-headless)	8m 34s
JS (macos-latest, chrome-headless)	4m 26s
JS (macos-latest, firefox-headless)	6m 1s
JS (macos-latest, webkit-headless)	6m 45s
	1h 8m 56s

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