(sgml-tag, html-tag-alist)

(sgml-tag, html-tag-alist)
(html-horizontal-rule, html-line, html-image, html-checkboxes)
(html-radio-buttons): Add a space before the trailing `/>' where
sgml-xml-mode is non-nil.
(sgml-delete-tag): Check if the tag ends with `/>' to not delete
the subsequent tag of the empty XML tag.
(html-href-anchor): Don't set initial input to "http:".
(html-image): Ask for the image URL and set point inside alt="".
(html-name-anchor): Duplicate the name in the `id' attribute when
sgml-xml-mode is non-nil.
(html-paragraph): Remove \n before <p>.
(html-checkboxes, html-radio-buttons): Insert `checked="checked"'
instead of `checked' when sgml-xml-mode is non-nil.