Fixed HTML formatting in checkboxHasLabel.html.

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>
Refined label.js.

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>
Refactored closingTagsAreUsed.html

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>
Converted closingTagsAreUsed

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>