Steps to replicate the issue (include links if applicable):

• Affecting for example: https://en.wikipedia.org/api/rest_v1/page/mobile-html/Stellar_nucleosynthesis
• Similar to usability impact of the now-fixed T312667 and T313498

What happens?:

Empty horizontal space caused by math elements resulting in scrolling difficulty

What should have happened instead?:

I think, math elements should be rendered in their own horizontally scrollable area (see example attached below)

Software version (skip for WMF-hosted wikis like Wikipedia):

6.9.3

Other information (browser name/version, screenshots, etc.):

Above shows problem

Above shows possible solution(?)