View of a page in a responsive mode with a smartphone

[rudolfine]

View of a page in a responsive mode with a smartphone

[dginev]

@rudolfine Thank you for the report. Could you also provide us with:

• The web browser name and version you are using.
• A screenshot of what you are describing.
• Ideally the source file and the exact conversion command, to check which CSS assets are used.

Judging from point b), it is possible that both of your reports are due to viewing without a "math font" available in your browser. There is some MDN documentation on how to achieve that on one's own on a mainstream system:
https://developer.mozilla.org/en-US/docs/Web/MathML/Fonts

Although most up-to-date browsers should already have such font available.

[xworld21]

Point a) also sounds like a general MathML font-related problem. Unfortunately, for a), I don't think any font renders primes in a good way just yet (cf. w3c/mathml-core#135).