w3schools.com
w3schools.com
developer.mozilla.org
Mozilla Developer
https://developer.mozilla.org › en-US › docs › Web › CSS › ::before
css-tricks.com
css-tricks.com
geeksforgeeks.org
geeksforgeeks.org
GeeksForGeeks
https://www.geeksforgeeks.org › css-before-selector
freecodecamp.org
freecodecamp.org
w3.org
World Wide Web Consortium (W3C)
https://www.w3.org › wiki › CSS › Selectors › pseudo-elements › :before
techonthenet.com
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