Query-Select-Hide Cloudflare app
qsh (pronounced 'quash') is a Cloudflare app that enables selective hiding of page content in response to
a boolean query string parameter. It may be injected into any page that is proxied by Cloudflare.
When navigating to a supporting page, a small piece of JavaScript checks for the presence of a query string parameter.
The parameter name is configurable, and defaults to quash-all-the-things.
If the parameter's value is 1 (i.e. the URL looks like www.cloudflare-proxied-site.com/?quash-all-the-things=1),
the app will hide any elements that match the user-configurable list of CSS selectors. If the parameters's value is 0,
the elements will be shown as normal.
The last-received parameter value is stored in a cookie, so that it is preserved across page navigation.