- Better degree of formatting- Easily maintainable websites- Faster to access- Quicker to download- Can be adopted for different mediums
CSS Versions
W3C published the CSS Level 1 Recommendation in 1996.
A year later, the CSS Level 2 Recommendation
CSS2.1, become an official W3C Recommendation until June 2011.
CSS2.1 standard was being worked on, a different group at the W3C was working on a CSS3 draft.
Browser Adoption
While Microsoft’s Internet Explorer was an early champion of CSS, its later versions (especially IE5, IE6, and IE7) for Windows had uneven support for certain parts of CSS2.
In fact, all browsers have left certain parts of the CSS2 Recommendation unimplemented.
CSS has a reputation for being a somewhat frustrating language.
CSS Syntax
Properties
Properties
Properties
Element Selectors
selects all instances of a given HTML element
Grouped Selector
Universal Selector
Inheritance selector
Class Selectors
Simultaneously target different HTML elements
ID Selectors
Target a specific element by its ID attribute
Attribute Selectors
Selecting via presence of element attribute or by the value of an attribute
Pseudo Selectors
Select something that does not exist explicitly as an element
Contextual Selectors
Select elements based on their ancestors, descendants, or siblings
Cascade: Styles Interact
Principles to handle cascades (conflicts)
Inheritance
Specificity
Location
Specificity Algorithm
Location
When inheritance and specificity cannot decide
Box Model
think inside the box
Collapsing Margins
Width and Height
The width and height properties specify the size of the element’s content area.
Only block-level elements and non-text inline have a width and height.
By default the width of and height of elements is the actual size of the content.
For text, it is font size and font face;
For images - the width and height of the actual image in pixels
