Here's my crib sheet for html. Haven't heard of anything similar on the web although I'm going to add it to my home page soon where it will be regularly updated. Can be justified to the left, right or center.
Size is the height of the line in pixels.
Width is the length of the line across the screen. Aligns the picture with the blob at the top if in a list or produces the preceeding or next line of text alongside and at the top of the image. Aligns the picture with the blob at the middle or produces the preceeding or next line of text at middle and alongside image. This area is said to be anchored. Animations and video can be placed onto the Web.