3 Answers
New AnswerIt means that the same piece of code works the same way in every type of browser let it be google chrome or microsoft internet explorer. It can be applied to css or javascript because they run in the browser. However, to go back to your original question: php is executed on the server so, cross browser compatibility doesn't apply.
Learn Playing. Play Learning
SoloLearn Inc.
4 Embarcadero Center, Suite 1455Send us a message