History of CSS
1994
Håkon Wium Lie proposes CSS while working at CERN with Tim Berners-Lee
1996
CSS Level 1 becomes an official W3C Recommendation
1998
CSS Level 2 is released with positioning and z-index
2011
CSS Level 3 modules begin rolling out with new features
Key Features of CSS
- Separation of content from presentation
- Consistent styling across pages
- Easy maintenance and updates
- Better accessibility
- Improved page load times
CSS Code Example
/* Basic CSS Syntax Example */
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
border-radius: 4px;
}
CSS Selectors
| Selector | Example | Description |
|---|---|---|
| Element | p { } | Selects all <p> elements |
| Class | .class-name { } | Selects elements with class="class-name" |
| ID | #id-name { } | Selects element with id="id-name" |