Spun out of T251664
**Steps to replicate the issue** (include links if applicable):
* Open https://en.m.wiktionary.org/wiki/Wiktionary:Main_Page#/search
* Focus the search input
* Inspect the input element
**What happens?**:
The search input should have autocapitalize="sentences" on it.
**What should have happened instead?**:
The search input should have autocapitalize="none" on it.
# Developer notes
It seems like the behaviour of `$( '#searchInput' ).prop( 'autocapitalize' )` differs on browser. On Firefox it returns undefined and on Chrome it returns "none".
autocapitalize acts like a property in Chrome (`document.getElementById('searchInput').autocapitalize` returns 'sentences' in Chrome but undefined in Firefox. According to specs it should probably be an attribute.
jQuery however is supposed to provide consistency between browsers so I wonder if this is an upstream jQuery bug?
Regardless, this should probably be changed to `$( '#searchInput' ).attr( 'autocapitalize' )`