**Steps to replicate the issue** (include links if applicable):
* Sign in
* Go to https://en.m.wikipedia.org/w/index.php?title=Angel_Aquino&diff=1204364313&oldid=1204331982&title=Angel_Aquino&diffonly=1 or https://en.m.wikipedia.beta.wmflabs.org/w/index.php?title=T352930&diff=612901&oldid=610663&title=T352930&diffonly=1 on mobile.
* Inspect the title of the page "T352930: Difference between revisions"
**What happens?**:
The font size is 27px.
**What should have happened instead?**:
The font-size should be 24px.
**Software version** (skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
Compare before and after:
* https://en.m.wikipedia.org/w/index.php?title=Gwen_Robinson_Awsumb&diff=1168068915&oldid=1130684071&title=Gwen_Robinson_Awsumb&diffonly=1
* https://en.m.wikipedia.org/w/index.php?title=Special:MobileDiff/1168068915&diffonly=1