What's the difference and which one's accepted by the web browsers?

Question

Color: gray;
Color: grey;

Answer 1

Grey and Gray both are common

Gray is more frequent in American English whereas grey is more common in British English

Both are accepted by web browsers

Answer 2

Thank you for your answers guys much appreciation!

Answer 3

One is American. One is British. The American one is probably the one web browsers use going by the other colour spellings. I don't know for sure which is which, best thing to do is to try it.