The three main features of CSS and the introduction of setting the background transparency

This article introduces to you about the three characteristics of CSS and set the background transparent introduction, there is a certain reference value, the need for friends can refer to, I hope to help you.

About inline elements (add a little)

Inline elements can only hold text or other inline elements. (A special A can put block-level elements)

Example:

About Line Height tip:

The nesting level of the selector should not be greater than level 3, and the qualifying conditions after the position should be as accurate as possible.

The property definition must have a different row.

Measurement of line height:

Three main features of CSS (Cascade precedence inheritance)

A, cascading: A variety of CSS style overlay

is the ability of a browser to handle conflicts, and if a property is set on the same element with two identical selectors, then one property will cascade the other property.

In general, if a style conflict occurs, the final style will prevail in the order in which the CSS is written.

B, priority

When you define a CSS style, there are often two or more rules that should be on the same element, with priority issues.

The weights of the styles can be superimposed

Generally speaking

Inline label > ID selector > class label > tag Selector > Wildcard selector (no weight)

Tip: Background Translucent settings Background:rgba (0,0,0,3);

The last parameter is the Alpha transparency value range between 0-1

Note: The background translucent refers to the box background translucent, the contents of the box is not affected.