BREAKING CHANGE: This change refactors menu-item to no longer subclass or import from list-item. It also refactors it to use md-item directly which means that the API of menu item has moved from properties to slots. `start-*` and `end-*` slots are now just `start` and `end`, many tokens are now gone in favor of slotting. `headline` property is now a `slot="headline"` slot. Typeahead search text can now be set via `typeaheadText` which defaults to the slotted headline `textContent`. `select-option` now has the `displayText` which is used to display text in the `md-select` when the option is selected; defaults to the slotted headline `textContent`.
PiperOrigin-RevId: 567719483
Note: tests have changed significantly because there is no longer a concept of "nothing activated" in the list.
BREAKING CHANGE: removed `active` from list-item, menu-item, and select-option. Instead, List uses tabindex to track whether something is focusable.
PiperOrigin-RevId: 565531998
Why? This is needed for selects in forms, which uses the `selected` attribute to indicate default selected values when resetting.
BREAKING CHANGE: `option.selected` no longer reflects. Set the attribute instead if relying on the attribute for styles/queries.
PiperOrigin-RevId: 565212026
BREAKING CHANGE: Rename `@material/web/<component>/lib` to `@material/web/<component>/internal`. Prefer not using internal files.
PiperOrigin-RevId: 550633216
