Michael McNeil Forbes

I have been playing a bit with [JupyterBook](https://jupyterbook.org) (actually, just using [Sphinx](https://www.sphinx-doc.org) with the MyST extensions) and think that [MyST](https://myst-parser.readthedocs.io) is a very reasonable option. For example, it might be...

Another extremely useful feature would be a way of annotating PDF or similar files. Google provides rudimentary support for this, but most other platforms do not. As for commenting on...

> Can you define very precisely what you mean by "erase elements"? Do you mean that you want to delete the element? If so, you could select the element, then...

I uploaded a couple of videos showing my setup in my [test project](https://cocalc.com/projects/d8321832-12e5-4c52-ac0b-46b5f29e9740/files/). I demonstrate how I would like Erase to work. Unfortunately I could not trigger the latency/lag issue......

*(I meant to pause the video, but accidentally stopped it.)* Pressure support looks cool, and is good for sketching, but I think might not be ideal for teaching, so maybe...

Maybe... would have to try. I am not sure how accurate my pressure is right now:-)

@williamstein Thanks! Erase works now in Chrome, but does not work in Firefox or Safari for me (on Mac OS X). I tried the [link you posted above](https://patrickhlauke.github.io/touch/tracker/multi-touch-tracker-pointer-hud.html) but don't...

Also for Markdown files: it would be helpful to be able to select a chunk of text, and then count the words in this region. Use case: Brainstorming for a...

Looking at [src/extensions/katexExtension.js](https://github.com/benweet/stackedit/blob/master/src/extensions/katexExtension.js) and the output, it seems like the expressions are rendered individually in the preview. Hence, macro definitions from one equation do not propagate to the others. Is...

@ZhangTianrong No.