I've noticed some web URLs link to a web page with highlighted text. This appears to be controlled by an escape sequence in the URL of the form
StartText indicates where on the page to begin the highlighting and
EndText is where on the page to terminate the highlighting.
What API/standard/protocol/etc. defines/permits/governs this highlighting behavior?
Bonus points for addressing how portable this is. (It works on Google Chrome, but doesn't work in Apple's Safari for macOS.)