Using slot= attribute on link rel=import> (Imports without

Re-file Issue #1256 from programmer3000 from programmer3000: HTML have no description for slot attribute

The let: directive goes on the element with the slot attribute attribute names and HTML-specific warnings; customElement= — the name to

html slot machine label property: used for plaintext labels; label slot: used for custom HTML labels ; aria-label : used to provide a label for screen readers but

html5 slot machine !doctype html> html > For each member → value in dictionary , if event has an attribute whose identifier is member , then initialize that