When a browser reads a style sheet, it will format the document according to it.
There are three ways of inserting a style sheet:
An external style sheet is ideal when the style is applied to many pages. With an external style
sheet, you can change the look of an entire Web site by changing one file. Each page must link
to the style sheet using the <link> tag. The <link> tag goes inside the head
An external style sheet can be written in any text editor. The file should not contain any html
tags. Your style sheet should be saved with a .css extension. An example of a style sheet file
is shown below:
Do not leave spaces between the property value and the units! "margin-left:20 px"
(instead of "margin-left:20px") will work in IE, but not in Firefox or Opera.
An internal style sheet should be used when a single document has a unique style. You define
internal styles in the head section of an HTML page, by using the <style> tag, like
An inline style loses many of the advantages of style sheets by mixing content with presentation.
Use this method sparingly
To use inline styles you use the style attribute in the relevant tag. The style attribute can
contain any CSS property. The example shows how to change the color and the left margin of a
If some properties have been set for the same selector in different style sheets, the values will
be inherited from the more specific style sheet.
For example, an external style sheet has these properties for the h3 selector:
And an internal style sheet has these properties for the h3 selector:
If the page with the internal style sheet also links to the external style sheet the properties
for h3 will be:
The color is inherited from the external style sheet and the text-alignment and the font-size is
replaced by the internal style sheet.
Styles can be specified:
Hint: Even multiple external style sheets can be referenced inside a single HTML document.
What style will be used when there is more than one style specified for an HTML element?
Generally speaking we can say that all the styles will "cascade" into a new "virtual"
style sheet by the following rules, where number four has the highest priority:
So, an inline style (inside an HTML element) has the highest priority, which means that it will
override a style defined inside the <head> tag, or in an external style sheet, or in a
browser (a default value).
Note: If the link to the external style sheet is placed after the internal style sheet in
HTML <head>, the external style sheet will override the internal style sheet
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