dom3d: a tiny spatial DOM viewer

Installation

You can install this extension from the Firefox and Chrome extension stores or download the latest release and follow the instructions for your browser below.

Universal bookmarklet version

Simply prefix this code with `javascript:` and save it as a bookmark on Chrome or Firefox. This is a 1-1 equivalent to the full extension with the default configuration.

(()=>{let e=t=>[...t.children].reduce((t,n)=>Math.max(t,e(n)),0)+1,t=e(document.body),n=(e,n=0,o=0)=>`hsl(${n}, 75%, ${Math.min(10+e*(1+60/t),90)+o}%)`,o=document.body;o.style.overflow="visible",o.style.transformStyle="preserve-3d",o.style.perspective=1e4;let r=window.innerWidth/2,i=window.innerHeight/2;o.style.perspectiveOrigin=o.style.transformOrigin=`${r}px ${i}px`,function e(t,o,r,i){for(let l=t.childNodes,s=l.length,d=0;d<s;d++){let s=l[d];if(1!==s.nodeType)continue;let f=n(o,190,-5);Object.assign(s.style,{transform:"translateZ(20px)",overflow:"visible",transformStyle:"preserve-3d",backgroundColor:f});let a=r,c=i;s.offsetParent===t&&(a+=t.offsetLeft,c+=t.offsetTop),e(s,o+1,a,c)}}(o,0,0,0),document.addEventListener("mousemove",e=>{let t=180*(1-e.clientY/window.innerHeight)-90,n=180*e.clientX/window.innerWidth-90;o.style.transform=`rotateX(${t}deg) rotateY(${n}deg)`})})();

In Firefox

1. Go to about:debugging#/runtime/this-firefox
2. Click "Load Temporary Addon"
3. Select manifest.json in the downloaded folder
4. Extension should now be installed, you can find it in the top right extensions menu (puzzle piece icon) and pin it if desired

In Chrome/Chromium browsers

1. Go to chrome://extensions
2. Enable "Developer Mode" in the top right
3. Click "Load Unpacked"
4. Select the downloaded folder
5. Extension should now be installed, you can find it in the top right extensions menu (puzzle piece icon) and pin it if desired

Specific Chromium browsers may have additional steps.

• In Opera, enable "Allow access to search page results"

In Microsoft Edge

1. Go to edge://extensions
2. Click "Load Unpacked"
3. Select the downloaded folder. Please use the Chrome version of the extension.
4. Extension should now be installed, you can find it in the top right extensions menu (puzzle piece icon) and pin it if desired

Usage

Click the extension icon to enable 3D DOM view or right-click it for options.

Option	Description
Show Surfaces	Toggle visibility of element surfaces
Show Sides	Toggle visibility of element sides
Require Drag	Only rotate when dragging
Require Alt	Only rotate when Alt key is pressed
Randomize Color	Apply random colors to elements
CSS Selectors	Set CSS selectors to selectively color elements

Development

1. Run yarn install
2. Run yarn watch to watch for changes and automatically rebuild the extension.
3. Load the extension from dist/{browser} following the steps above.

For Safari, you can run xcrun safari-web-extension-converter dist/safari and try to go from there. No success so far.

Known Issues

All help in diagnosing and fixing these key issues is welcome! I've linked to an Issue for each of them.

• The z-ordering of DOM elements from the 'cameras' perspective is incorrect in some cases.
• Some websites (like GitHub) appear flat when their DOM clearly isn't.
• Some elements don't increase stack height, such as <a> and <i> tags.