\@danielsgriffin via Twitter on Feb 1, 2022

Loading a page to search I aim to paste/type immediately, which needs the cursor in the search box.

works:
B, DDG, Ecosia, G, Neeva, SS, You, etc.
web.​archive.​org
WorldCat


does NOT work\*:
lib.​berkeley.​edu (?!)
openlibrary.​org
archive.​org

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Github​.com doesn't paste, and doesn't show a blinking cursor, but it does put typed characters (after using the 's' shortcut\*\*) into the search box.

Stack Overflow doesn't have the cursor in the box, and also forces (those not logged in) into a CAPTCHA flow.\*\*\*

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\* These each do use OpenSearch Query Syntax(?) that enables search from the address bar.
\** I stumbled on this, tapping frustrated, then confirmed.
\*** You must "Enable keyboard shortcuts" with a profile via settings to enable 's' to focus on the search box in Stack Overflow.