Browser always report message with errors, but in servo we only do messages for type and range errors. I think we should start writing actual error messages.

The first step towards it is to add Option<String> field to each variant in

I suggest one for each PR (as we need to fix all occurrences to pass None and eventually build actual errors). See #39056 for example of such PR.

• IndexSize
• NotFound
• HierarchyRequest
• WrongDocument
• InvalidCharacter
• NotSupported
• InUseAttribute
• InvalidState
• Syntax (script: Add message to SyntaxError #39056)
• Namespace
• InvalidAccess
• Security
• Network
• Abort
• Timeout
• InvalidNodeType
• TransactionInactive
• ReadOnly
• Version
• NoModificationAllowed
• TypeMismatch
• InvalidModification
• NotReadable
• Data
• Operation
• NotAllowed
• Encoding
• Constraint