Turn this link into a bookmarklet.

Save this page as a bookmark. Then edit that bookmark so its address starts with javascript:. The instructions below show exactly what to tap and delete.

Open this same link on your phone to install the bookmarklet there.

Instructions

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Bookmarklet code

This link does not contain bookmarklet code. It needs a fragment beginning with #javascript:.

If deleting the helper address is awkward, copy this code and replace the bookmark’s entire URL.

Bookmark title: Bookmarklet

Create a bookmarklet share URL

Paste or write a bookmarklet, choose the optional details, then copy or share the generated helper URL.

Start the code with javascript:.
Syntax is checked while you type. Formatting keeps the bookmarklet prefix and validates the finished result.