When generating a selector, we tend to match by role and call various
roleUtils methods multiple times.
Apply the usual pattern for "nested operations counter" and aggressively
cache the results.
When element is not assigned to any slot in the shadow root, it is not
rendered and is considered hidden for ARIA in all browsers.
In Chromium/Firefox we use `Element.checkVisibility` that already
handles this, but in WebKit we have to check it manually.
Fixes#21487.
This introduces `role=button[name="Click me"][pressed]` attribute-style
role selector. It is only available under `env.PLAYWRIGHT_EXPERIMENTAL_FEATURES`.
Supported attributes:
- `role` is required, for example `role=button`;
- `name` is accessible name, supports matching operators and regular expressions:
`role=button[name=/Click(me)?/]`;
- `checked` boolean/mixed, for example `role=checkbox[checked=false]`;
- `selected` boolean, for example `role=option[selected]`;
- `expanded` boolean, for example `role=button[expanded=true]`;
- `disabled` boolean, for example `role=button[disabled]`;
- `level` number, for example `role=heading[level=3]`;
- `pressed` boolean/mixed, for example `role=button[pressed="mixed"]`;
- `includeHidden` - by default, only non-hidden elements are considered.
Passing `role=button[includeHidden]` matches hidden elements as well.
