web-component-designer
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A Designer for HTML Components or Pages in a WebComponent
https://excalidraw.com/ For better SVG support, maybe arrows, layers, ...
https://github.com/GoogleChromeLabs/ProjectVisBug https://visbug.web.app/ Maybe we could get some ideas for extending designer
Try this code: ABCD Looks like this: 
- Delete should remove elment - Arrow Navigation + Enter should set selection - There should be a way to select a elment in tree, and after that the Arrow...
In RotateLeftAndRightContextMenu, Null Reference Exception when right-clicking outside the canvas, because the design item was null, but there was no check for is null.  
look if we could/should use it

Check if this is possible, for example via range and get Bounding client rect. see: https://stackoverflow.com/questions/6961022/measure-bounding-box-of-text-node-in-javascript
Look at Editorx: if overlays do not fit above, they are shown below: we also should have something like this