K-Meleon should have full HTML5 support. Other web browsers do. Also, you should implement the HTML5 video tag that YouTube uses here:
It should support Windows 98SE,Windows ME,XP, Vista, 7
1.) Future K-Meleon (1.6.x) version is based on Mozilla's Gecko Rendering Engine 1.9.x. So it will support HTML5.
2.) Windows 9x including ME do
Forum: Improvement requests