What if I skip <meta charset="utf-8">?

Answer 1

The only "risk" is to user incorrect display of characters outside the range of basics 127 first ascii code ( which means basic ponctuation, arabic digits, alphabet latin upper and lowercase non-accentuated essentially: make problem's for non-US languages ^^ -- utf8 is standard for a widely range of characther's sets, but to use it, you need also to save your html source file with this encoding, obiously :P )

Answer 2

Users browser will encode page with default encoding (usually ASCII or UTF-8)

Answer 3

@Monzer H ziad:

Sorry, but I have never use arabic language and never face your problem... so only advice I can suggest is to google your question: if you don't find anything (this would surprised me), maybe post a new question thread here or in a more leveled forum as stackoverflow (but they have probably already discuss about that ;))... if noone post an accurate answer in this actual thread during this time ^^