CSS Super Tips (1)

css| tips one. Using CSS abbreviations

Using abbreviations can help reduce the size of your CSS files and make it easier to read. The main rules for CSS abbreviations refer to the common CSS abbreviation syntax summary, which does not expand the description.

Two. Define units clearly, unless the value is 0

Forgetting to define the size of the unit is a common error for CSS Novice. In HTML you can write only width=100, but in CSS you have to give an exact unit, such as: width:100px width:100em. Only two exceptions can be defined without a unit: row height and 0 value. In addition, values must be closely followed by the unit, note, do not add spaces between values and units.

Three. Case sensitive

The element names defined in CSS,CSS are case-sensitive when used in XHTML. To avoid this error, I recommend that all defined names be lowercase.

The values of class and ID are case-sensitive in HTML and XHTML, and if you have to mix the case, carefully verify that your definition of CSS is consistent with the tags in XHTML.

Four. To cancel the element qualification before class and ID

When you write an element to define class or ID, you can omit the previous element qualification because the ID is unique on a page, and 鴆 Las S can be used more than once in the page. You define an element without meaning. For example:

div#content {/* declarations */}
Fieldset.details {/* declarations */}

can be written

#content {/* declarations */}
. details {/* declarations */}

This can save some bytes.