The advantage of using CSS is it's wide variety of styling in webpages. It gives you the authority to create whatever you want.
Most of the CSS is overall important. Styling text boxes, fonts, images etc can be done in CSS.
No tags are used in CSS. Tags are actually what CSS primarily styles.
Valid CSS is CSS that has been run through the W3C CSS checker and passed.
The Six Revisions website has an article that lists some websites that it recommends to people wanting to learn about cascading style sheets (CSS). One that they mention is a program called CSS Help Pile.
Answer 1: You're question must not be related to Cascading Stle Sheets as I have never seen a warning label on a CSS file. :P Answer 2: Your browser does not support CSS, or supports only limited functions of CSS or you have it switched off in your browser. Rely: There probably isn't that many browsers being used today that do not support CSS. Only some parts of the CSS is not supported in IE 6/7. Rest are either compliant or non-compliant:
lots of snow
Air pollution
What are the Advanages of Asexual reproduction?
that they are awesome
The only problem with CSS is browser incompatibility. Some of the css attributes do not work on old browsers.
None.
disadvanages of courage
Because there is no CSS 1.5 and CSS is not down loadable. CSS2.1 and partly supported CSS 3.0 are what you need to learn. Any downloads would be a tutorial of CSS in a PDF/ZIP or some format. See... CSS Tutorials might help you.
The most popular way (and to some, official) to validate your CSS is by going here: http://jigsaw.w3.org/css-validator
Most of the CSS is overall important. Styling text boxes, fonts, images etc can be done in CSS.
See the related links for CSS Tutorials and some other useful links.
No tags are used in CSS. Tags are actually what CSS primarily styles.