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"We're tight-fisted with property and money, yet think too little of wasting time, the one thing about which we should all be the toughest misers.”
Seneca

:host()

The :host() CSS pseudo-class function selects the shadow host of the shadow DOM containing the CSS it is used inside (so you can select a custom element from inside its shadow DOM) — but only if the selector given as the function's parameter matches the shadow host.
:host() css reference