HTML widget for browser arbitrary JavaScript objects. Very similar to the one in Chrome Dev Tools.

• syntax highlighting
• summary view of collapsed (sub)objects
• array length
• handles circular references
• preserve the current tree expansion when replacing the object with a copy

• add tests (and update the paths dictionary appropriately when properties get removed)
• limit how many items are displayed for arrays
• limit the length of the summary when items are collapsed
• support properties using Object.defineProperty (via getOwnPropertyNames)
• embed CSS
• provide a way to style the control
• Web Component version?