HTML and CSS 101


Starting with HTML 4.0, in an attempt to return HTML back to a pure content mark up and separate out styles, cascading style sheets were introduced and CSS declaration syntax in HTML was standardized.

CSS declarations are pretty straightforward — one or more key-value pairs, separated by semi colon in curly braces applied to an HTML element. The HTML element is called the selector. More here

Now, the tricky part on selectors. The hash and the dot.

You can restrict CSS formatting to a HTML element with a specific ID by using the #ID syntax.

E.g., if you have an HTML element called para1, you can restrict CSS to #para1.

On the other hand, if you want to apply the style to all elements, such as Center element in HTML, use the .Center.

Again more info here


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