It is possible to give a widget an ID that can't be queried back

[davep]

It is possible to give a widget an ID that can't then be queried back; for example:

from textual.app import App, ComposeResult
from textual.widgets import Label

class BadIDApp(App[None]):

    def compose(self) -> ComposeResult:
        yield Label("Hello, World!", id="foo&")

    def on_mount(self) -> None:
        self.notify(f"{self.query_one('#foo&')}")

if __name__ == "__main__":
    BadIDApp().run()

Perhaps we should validate widget IDs when they are assigned?

[willmcgugan]

We do this with class names, so it would be sensible to do it for IDs as well.

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