Building upon Edokter's idea, what about making all headers cursor: pointer, and making clicking on it give the anchor link?

The code that causes this notice doesn't exist in REL1_23. I think your version is beyond REL1_24?

I've created a prototype for approach D. To try it out, on mediawiki.org edit User:[your_username]/common.js and add the following line:

The task hasn't been approved/published by an org admin, so not everyone can see it yet.

I've tested this with Firefox & Chromium on mediawiki.org, form data was both preserved for me. Don't have IE to test.

You're right, Firefox does do that now.

Patch is, accidentally typed gerrit ID instead of phab task https://gerrit.wikimedia.org/r/#/c/181363

Firefox doesn't save form state on HTTPS pages

I requested the rights on test.wikipedia.org: https://test.wikipedia.org/wiki/Wikipedia:Requests/Permissions/Unicodesnowman -- thanks!

Could this be a GCI task? I'd like to work on it!

How can an anchor be created without HTML?

I've uploaded a new patch which will make the graph fill the viewport. It doesn't look too good in portrait -- the axis labels overlap, and the fidelity is too low. I think it looks good in landscape though.

Desktop before & after https://i.imgur.com/Wu0k9Qe.png (overflow fixed)
Nexus 5 Portrait http://i.imgur.com/c0MxIJk.png
Nexus 5 Landscape http://i.imgur.com/GNWCu3V.png

Would the internalAttemptSave() function in includes/EditPage.php be an appropriate place to add this check, with the resulting error being displayed in handleStatus()?

I added support for PMID, PMCID, Manuscript ID and versioned identifier (they all use the same API) with request.