Draws on PDF pages in the browser with one command per line: text | pages | x y | words | size | colour | bold,italic,center; rect, ellipse and highlight with a box and stroke/fill colours; line and path for freehand strokes; image to place an uploaded picture. Coordinates are PDF points from the bottom-left corner, and pages accept ranges and keywords (1-3, odd, all). Everything is drawn above the existing content, which is left untouched.