Disabling a checkbox or radio button during legacy-pre-activation behavior

[annevk]

If you disable a checkbox or radio button during pre-activation behavior, the control will change value, but activation behavior (or legacy-canceled-activation behavior) won't run for these checkboxes or radio buttons because they are disabled. This does not make much sense and is also not what implementations implement.

Related Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1520869.

(However, note there's also a general problem with disabled controls and event handling that isn't really capture by the specifications: whatwg/dom#687.)