Look up any file extension to its MIME type and back.
Parse a UA string into browser, OS, engine and device.
Break any URL into protocol, host, port, path, query and hash.
Decode QR codes from a camera or uploaded image.
Type y = something and it is drawn on a gridded canvas, with a hand-written parser, domain sliders and sample curves to click.
Translate text to Morse and back, then play the symbols as real tones through Web Audio.
Click any swatch to copy its hex, with tints mixed toward white and shades toward black in sRGB.
Assemble a keyframe animation visually and copy the CSS, with duration, easing, fill mode and delay controls.
