Currently it is not possible to force on certain features on via a query string. This got broken when we expanded our feature management to support beta features. In particular this impacts fontsize and pinning functionality.
For example:
https://en.wikipedia.org/wiki/Spain?vectorcustomfontsize=3 should provide large font size but doesn't - it provides whatever the user specified.
https://en.wikipedia.org/wiki/Spain?vectorpagetoolspinned=1 in an incognito window should show the page tools pinned but doesn't.
# QA
Check all the following URLs work for both anons and logged in
https://en.wikipedia.org/wiki/Spain?vectorzebradesign=0
https://en.wikipedia.org/wiki/Spain?vectorzebradesign=1
https://en.wikipedia.org/wiki/Spain?vectortypographysurvey=0
https://en.wikipedia.org/wiki/Spain?vectortypographysurvey=1
https://en.wikipedia.org/wiki/Spain?vectorclientpreferences=0
https://en.wikipedia.org/wiki/Spain?vectorclientpreferences=1
https://en.wikipedia.org/wiki/Spain?vectorlanguageinheader=0
https://en.wikipedia.org/wiki/Spain?vectorlanguageinheader=1
https://en.wikipedia.org/wiki/Spain?vectormainmenupinned=0
https://en.wikipedia.org/wiki/Spain?vectormainmenupinned=1
https://en.wikipedia.org/wiki/Spain?vectorpagetoolspinned=0
https://en.wikipedia.org/wiki/Spain?vectorpagetoolspinned=1
https://en.wikipedia.org/wiki/Spain?vectorstickyheader=0
https://en.wikipedia.org/wiki/Spain?vectorstickyheader=1
https://en.wikipedia.org/wiki/Spain?vectorlimitedwidth=0
https://en.wikipedia.org/wiki/Spain?vectorlimitedwidth=1
https://en.wikipedia.org/wiki/Spain?vectortocpinned=0
https://en.wikipedia.org/wiki/Spain?vectortocpinned=1
https://en.wikipedia.org/wiki/Spain?vectorcustomfontsize=0
https://en.wikipedia.org/wiki/Spain?vectorcustomfontsize=1
https://en.wikipedia.org/wiki/Spain?vectorcustomfontsize=2
https://en.wikipedia.org/wiki/Spain?vectorcustomfontsize=3
== QA Results - Beta
| **AC** | **Status** | **Details** |
| ----- | ----- | ----- |
| 1 | ❌ | T347900#9270529 |
| 2 | ❌ | T347900#9270529 |