ErrorEvent error attribute too limiting for the errors we use

[jan-ivar]

The current type of the ErrorEvent's error attribute is Error which is too limiting for the errors we want to use, like SecurityError.

It does the wrong thing, as can be seen here:

let errors = [
  new DOMException("The operation is not secure", "SecurityError"),
  new Error("SecurityError"),
];
console.log(errors.map(e => e.name)); // SecurityError,Error

Solved by #335 and any.

[jan-ivar]

TIL that Error does in fact have a name field, just not a constructor for it. Who knew?

Even so, by going with the html one, we can throw whatever, be it Error, TypeError etc. or DOMException, we're not limited.

[jan-ivar]

Closing this in favor of #337. Can reopen if the other one fails.