ith browsers that do not support <iframe>, add a text between the opening <iframe> tag and the closing </iframe> tag.

Tip: Use CSS to style the <iframe> (even to include scrollbars).
Differences Between HTML 4.01 and HTML5

HTML5 has added some new attributes, and several HTML 4.01 attributes are removed from HTML5.
Differences Between HTML and XHTML

In XHTML, the name attribute is deprecated, and will be removed. Use the global id attribute instead.