Drawing board
A blank canvas, a few colours, and nothing else in the way · Art ●●○
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Prompt
Make a drawing board with a soft brush on white paper. Make it a single HTML file that opens in a browser with nothing to install and no other files. Put the CSS and JavaScript inside it. Do not use image files or any external address; use emoji or letters if you need a symbol. The canvas fills most of the screen. A small row of controls: six colours, three brush sizes, an eraser, undo, and clear. Drawing has to work with a finger on a phone as well as a mouse. Test both in your head — touch events are the part that usually gets forgotten. Undo should step back one stroke at a time, not clear everything. Keep the last twenty strokes. Put a download button that saves what I drew as a picture. ⚠️ Nothing leaves the browser. Do not upload the drawing anywhere. When you are done, check that a stroke drawn quickly is still a smooth line rather than a row of dots.
What it uses: One file only · Say what it is first · Decide what shows · Pin down what not to do
If fast strokes come out dotted, ask it to "draw a line between the last point and the new one".
Paste what came back
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