2023-09-30 UTC
# 
[tantek] protocol relative URL is a URL on a page (hyperlink, image source or similar) that starts with "//" and re-uses the protocol of the page itself, typically re-using http: or https: from however the page was loaded, which used to be a common web development practice and is now generally discouraged for a various [[performance]] and [[security]] reasons. https://www.paulirish.com/2010/the-protocol-relative-url/ and