In short, no.
Quirks mode HTML (no doctype) can be written in any form of casing you want. HTML markup should be written in lowercase as a rule of thumb. XML requires you to use lowercase or errors will be generated.
No the only time that it is, is when you are doing list types
CSS selectors are NOT case insensitive (this includes class names and ID selectors), but HTML class names and other attributes are case sensitive.
yes
Although, there are no case-sensitivity of CSS, nevertheless font families, URL's of images, etc is. Only when XML declarations along with XHTML DOCTYPE are being used on the page, CSS is case -sensitive.
HTML was designed to allow for any variation of case in the tags. However, new HTML 5 and CSS rules require your HTML tags to be in lower case. For example <P></P> would be acceptable in HTML 4, but <p></p> would be required under the HTML 5 standards.
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C is case sensitive, which means that, for example, $var and $VAR are not the same variable.
yes.
Although, there are no case-sensitivity of CSS, nevertheless font families, URL's of images, etc is. Only when XML declarations along with XHTML DOCTYPE are being used on the page, CSS is case -sensitive.
Yes xml is case sensitive, this includes enumerations which are also case sensitive.
HTML was designed to allow for any variation of case in the tags. However, new HTML 5 and CSS rules require your HTML tags to be in lower case. For example <P></P> would be acceptable in HTML 4, but <p></p> would be required under the HTML 5 standards.
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Both. "Case sensitive" means that upper case and lower case characters are treated as different characters.
Yes. C and C++ are case sensitive, although, depending on implementation, external symbols might not be case sensitive.
Something is case sensitive when it requires proper capitalization and lower case letters as well as numbers. Case sensitive passwords will not work if you forget to make sure the proper letters in words used for password are capitalized. An example of a case sensitive word would be WikiAnswers.
Yes they are case sensitive.. :-)
A URL is case sensitive. An email address is not. If you had an address of AbCd, the email provider will automatically switch it to abcd, even if you type it as AbCd. (In years past, email addresses were all case sensitive. But not now.) Passwords though are all CaSe SenSitIve.
No. HTML tags are not case sensitive. However, he standard approach by designers now, is to type them in lower case.
No.
No.