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In JavaScript undefined is a special value used when a variable has not had a value set to it, or has not been declared.
There are many sets of special characters used.
Since JavaScript is a client-side language, all input will be validated on the client-side. This could be simple validation of forms such as checking if the user-submitted e-mail is actually an email, or if the submitted name doesn't have special characters (!#%) etc. These validations can easily be bypassed by manipulating the javascript, so it's not safe. Typically you would do some validation on the server-side just to be safe when storing to a database.
You don't. JavaScript is a special type of language which you will typically find embedded in the program which use them. For example, each web browser on your computer will have its own version of JavaScript.
One can find a list of special characters in HTML when one goes to the website of the University of Texas. There is a special page entitled "HTML characters". There one can find the special characters as well as their meanings.
A question mark ? and an asterisk *
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Special alt characters are special characters that cannot be typed easily or are not in the keyboard. You need to type in a number of keys to make special letters/symbols/etc come up.
Letters, digits, punctuation marks, and special codes (i.e. characters) are represented by sequences of short and/or long pulses separated by short gaps. Short pulses are called dots and pronounced as "di" except at the end of a character, where they are pronounced as "dit". Long pulses are called dashes and are pronounced as "dah". Characters are separated by long gaps.
Java and JavaScript are different, and quite unrelated, languages. JavaScript is not "for Java"; basically you use JavaScript to create special effects on Web pages (HTML pages).
The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.The order from highest to lowest is letters, special characters, numbers and blanks.
Click on Insert and then Special Characters. Click on chosen character, then OK, and the special character will appear in the document at the cursor.