Labels for radio buttons and checkboxes are not sensitive, i.e., clicking on a label text doesn't effect the button state. There is no way to markup groups of related form fields in a way that effectively supports browsing with speech-based user agents. There is no provision for checking values as they are entered into form fields. All checking is done at the server when the form's contents are submitted. Nothing is provided to specify what type of data file is expected when the user is asked to submit files.
Forms can only contain the two buttons submit and reset.
There is no way to specify what character sets the server issuing a form can handle. To solve these problems this specification introduces several new attributes and elements. The accesskey attribute provides for specifying direct keyboard access to form fields. The disabled attribute allows form providers to make a form control initially insensitive. And with the additional attribute readonly , authors can prohibit changes to a form field.