Based on a sample of 2,823,262 web sites, the following table illustrates the penetration rate of a variety of client side technologies:

Technology	Sites	Percentage
JavaScript	1,907,615	67.57%
Frames	179,077	6.34%
StyleSheets	1,956,076	69.28%
Java	9,087	0.32%
IFrames	618,572	21.91%
GIF Images	1,692,531	59.95%
JPG Images	1,682,071	59.58%
PNG Images	888,061	31.46%
Flash/Shockwave	326,574	11.57%