Introduction To CSS - Created By World Wide Web Consortium

What is CSS?

• CSS is a cascading style sheet.

What is the role of CSS?

• CSS defines how to display HTML elements.

Who developed CSS?

• The worldwide web consortium (W3C) created CSS.

Current version:

•  Currently, we are using CSS 3.

Where to write CSS?

• We can easily write CSS in a separate file and then link it to our HTML file or embedded CSS in the HTML file itself.

• External style sheet

•  Internal style sheet

•  Inline style 

 CSS syntax: 

 
Element selector
{
PropertyName:PropertyValue;
PropertyName:PropertyValue;
PropertyName:PropertyValue;
....
}

Element selector:

• Actually, an Element selector is used to specifying an HTML element or group of HTML elements on which properties are applied.

• Mostly, There are three ways to specify an element selector

1. Tag name
2. ID value 
3. Class value

PropertyName:PropertyValue:

• PropertyName is the name of the CSS property name followed by colon(:) and then Property value.

• Basically, we can write one or more property declaration in the block.

Selector: 

 
Tag name:

• This is tag name used in HTML this causes selection of all elements with the specified tag name.

ID value:

• The ID value is unique for HTML elements so it is used to select a specific element. 

• The id value is prefixed with has(#) symbol when mentioning in the selector.

Class Value:

• Class value can be common to heterogeneous HTML elements which causes selection of more than one HTML element.

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