Markup

Markup is a Chrome extension that let's you markup content on any live page and paste it as one prompt for your AI agent.

It can also copy them as plain English for Slack.

Install

1. Clone the repo, or download it as a ZIP and unzip it:

   git clone https://github.com/jonnilundy/markup.git

2. Open chrome://extensions.
3. Turn on Developer mode (top right).
4. Click Load unpacked and pick the markup folder (a folder, not a ZIP).
5. Click the puzzle-piece icon in the Chrome toolbar and pin Markup.
6. Reload any tabs that were already open.

It also works in other Chromium browsers that can load unpacked extensions, such as Edge, Brave, and Arc.

Usage

Click the Markup icon in the toolbar, or press Alt+Shift+E, to turn it on. The panel stays on as you move between pages.

• Edit Copy: click any text and type. Your change shows in the list with the old text crossed out.
• Comment: click any element and type a note, such as "remove this" or "make this shorter".
• Browse: use the page as normal while the panel stays open.
• Copy: copies every change from every page. The arrow next to it picks the format:
  • Copy for Agent: a detailed prompt with the exact current text, the new text, a CSS selector for each element, and instructions to report what it applied.
  • Copy for Human: plain English bullets to paste in Slack.

Copy for Human looks like this:

*Lumen*
https://lumen.example.com/
• Change "Analytics for teams that ship every day." to "Analytics for teams that ship."
• On the link "Book a demo": Remove this, we only want one CTA

Drag the panel by its top bar, or flick it, to move it to any corner. It remembers the corner. The minimize button turns it into a small pill. Click the pill to open the panel again. The × button clears every change (it asks first) and turns Markup off.

Key	Action
Alt+Shift+E	Turn Markup on or off
Enter	Save an edit or a comment
Shift+Enter	New line in an edit or a comment
Esc	Undo the current edit, cancel a comment, or switch to Browse
↑	Select the parent element in Comment mode

Privacy

Markup asks for one permission, storage. It runs on every page so the panel can open anywhere, but it does nothing until you turn it on. Your changes are saved in chrome.storage.local on your machine. Nothing is sent anywhere. The only way data leaves the browser is when you click Copy and paste it yourself.

Contributing

There is nothing to build. Edit the files and click reload on the extension card in chrome://extensions.

• content.js: the panel, the page overlays, and both copy formats
• background.js: the toolbar button and the keyboard shortcut
• vendor/liquid-glass.js: the liquid glass filter, adapted from liquid-glass by Shu Ding (MIT)
• test/harness.html: a demo page with a stand-in for chrome.storage, so you can try the panel by opening the file directly, without installing the extension

License

MIT. See LICENSE.