any one knows what are these = ::before and ::after

Question

commonly in websites betwen html tags

Answer 1

psuedo selectors whose properties you can't access using js but they can be used in css to add some content before and after a element . They are displayed as inline by default . You can do a quick search to find examples like such,

https://developer.mozilla.org/en-US/docs/Web/CSS/::before

Answer 2

thanks was good enough.