HTML

The HTML editor opens .html text files with two views over the same source.

Interactive HTML editorEdit the markup, then switch to the live sandboxed preview. Nothing here is saved to a tray.

Try the editor

Views

• Edit provides HTML syntax highlighting, including embedded <style> and <script> content.
• Preview renders the document live in a sandboxed iframe.

The preview sandbox

The preview runs with an opaque origin — the iframe is sandboxed with allow-scripts and allow-modals but deliberately not allow-same-origin. In practice that means your page’s scripts execute (and alert()/confirm() work for quick experiments), but they cannot reach Worktray’s origin, localStorage, or IndexedDB. You get a real, interactive preview without giving the page access to your data.

This is the same sandboxing invariant Worktray applies to all runnable content; see Privacy and local data.