Shadow DOM: Slots and fallback contents

third_party/blink/web_tests/external/wpt/shadow-dom/slot-fallback-content-004.html

150.0.7829.2234 B

Test passes if there is one line of text "SLOT1" below.

SLOT1 FAIL

Test passes if empty.

FAIL

Test passes if there is one line of text "SLOT3" below.

SLOT3 FAIL

Test passes if there is one line of text "SLOT4" below.

SLOT4 FAIL