Playground
Live HTML/JS editor — preview is isolated in an iframe srcdoc that loads the real flash.js.
HTMLF(htmlString) creates elements
JavaScript — FLASH.jsCtrl+Enter to run
Auto-saved via F.storage
Preview — isolated iframeflash.js loaded inside srcdoc
Dogfooding: Editor state, Run, Reset, Copy all use
F.* — F.storage, F.copy, F.toast, F.confirm, F.on.