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Topics

  • CSS Introduction
  • CSS Syntax and CSS Comments
  • CSS Selectors
  • How to add CSS to a Webpage
  • CSS Color Basics
  • CSS Background Properties
  • CSS Border Properties
  • CSS Margin and Padding Properties
  • CSS Height and Width properties
  • CSS Box Model
  • CSS Outline Properties
  • CSS Fonts
  • CSS Text
  • How To Add Icons
  • CSS Links
  • CSS List-Style
  • CSS Tables
  • CSS Display Property
  • CSS Position Property
  • CSS Overflow Property
  • CSS max-width Property
  • CSS Float and Clear Properties
  • CSS Alignment
  • CSS inline-block
  • CSS Combinators
  • CSS Pseudo Classes
  • CSS Pseudo Elements
  • CSS Opacity
  • CSS Navigation Bar
  • CSS Dropdowns
  • CSS Image Gallery
  • CSS Image Sprites
  • CSS Attribute Selector
  • CSS Styling Forms
  • CSS Counters
  • CSS Units
  • CSS Specificity
  • CSS Website Layout
  • CSS Rounded Corners
  • CSS Border Image Property
  • CSS Multiple Backgrounds
  • CSS Gradient
  • CSS Shadow Effects
  • CSS Text Effects
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  • CSS 2D Transforms

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CSS Syntax and CSS Comments

CSS Syntax

CSS syntax contains set of rules. These rules have 2 parts: a selector, and declaration (property, and a value).
h1  //Selector

{

background-color: blue;  //Declaration

font-size:20px;  //Declaration

}
The selector indicates the HTML element you want to style, like any tag <h1>, <p> etc.
The declaration block consists of one or more declarations separated by semicolons.
Each declaration contains a CSS property name and a value, separated by a colon.
The declaration blocks are surrounded by curly braces and each CSS declaration ends with a semicolon.

Example:

Here, all <h1> elements will be yellow background, and blue text color.
h1 {

background-color: yellow;

color: blue;

}
Try it

CSS Comments

CSS comments are used to explain a block of code or to make temporary changes during development. Comments are ignored by browsers. A comment are single line or multiple lines starts with /* and ends with */.
CSS does not support inline comments, like // in C or JavaScript. If you insert // before a property, that property will not be applied, looking like the comment worked. But in reality, CSS detected a syntax error and due to how it works it ignored the line with the error, and went straight to the next line. Knowing this approach lets you purposefully write inline comments, although you have to be careful because you can’t add random text like you can in a block comment.

Example:

h1 {

background-color: yellow;   /* This is a single-line comment */

text-align: center;

}

/* This is

a multi-line

comment */
Try it

Case Sensitivity in CSS

The CSS property names and many values are not case-sensitive. But, CSS selectors are usually case-sensitive, for example, the class selector .firstHeading is not the same as .firstheading. Therefore, to be on safer side, you should assume that all components of CSS rules are case-sensitive.

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