The best replacement for html4 is html5.

The best alternatives to html4 are rated as following:
★★★★★  html5
★★★★  xhtml
★★  html5 doctype

Your alternative for html4 is not listed? Suggest!


No companions for html4 have been suggested so far.
You have in mind a companion for html4 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of html4 in all years. Click on graph for more.
html4
html5
xhtml