Detailed interpretation of visual effects in the application of css3 new features

Table of Contents

• Background and Border Part One

• Background and Border Part Two

• shape

• ##Visual effects

• Typography

• User experience

• Structure and layout

• Transition and animation

• Source code download

1. Single-sided shadow

• Application of box-shadow attribute, format: h-shadow v-shadow blur spread color inset attribute value introduction

• h-sahdow: The position of the horizontal shadow, negative values ​​are allowed

• v-shadow: The position of the vertical shadow, negative values ​​are allowed

• blur: blur distance

• spread: the size of the shadow, expansion distance, can be a negative number

• color: the color of the shadow

• inset/outset: inner or outer shadow

• The shadow’s expansion distance is effective for all four sides and cannot be applied to one side alone.

• box-shadow supports settings for multiple sets of values ​​to take effect at the same time

• Sample code:

.wrap{
  width: 200px;
  height: 120px;
  background: yellowgreen;
  box-shadow: 2px 0px 4px -2px black,
  -2px 0px 4px -2px black;
}

2. Irregular projection

• Using the shape generated by border-radius, projection is good, but if pseudo elements and translucent elements are added Decoration and shadow performance are very poor, and there will be problems in the following situations.

• Semi-transparent image,

  Background image, or border-image

• element is set to dotted, Dotted or translucent border, but no background (or

  background-clip is not border-box)

• The small corners inside the element are generated using pseudo elements

• Shapes generated by clip-path

• Solution: Use drop-shadow of svg to achieve

• Sample code:

.wrap{
   width: 200px;
   height: 120px;
   border: 6px dotted yellowgreen;
   --box-shadow: 0px 0px 4px 0px black;
   -webkit-filter: drop-shadow(2px 0px 2px rgba(0,0,0,1))        
 }

3. Chromosome effect

• Based on filters , apply the relevant values ​​​​of the filter attribute to adjust the saturation, brightness and other values ​​​​of

  picture

## is implemented based on min-bl
• end

  -mode, Function: To realize the "mixing" of element content and background and the following elements

Basic background-blend-mode implementation, Function: To realize the mixing of background color and background image, background image and image
Sample codes for three situations:

• .wrap1{
              width: 200px;
              height: 120px;
              overflow: hidden;
          }
          .wrap1 > img{
              max-height: 100%;
              max-width: 100%;
              -webkit-filter: sepia(1) saturate(4) hue-rotate(150deg);
          }
  
          .wrap2{
              width: 200px;
              height: 120px;
              background: hsl(335, 100%, 50%);
              overflow: hidden;
          }
          .wrap2 > img{
              height: 100%;
              width: 100%;
              mix-blend-mode: luminosity;
          }
  
          .wrap3{
              width: 200px;
              height: 120px;
              background-size: cover;
              background-color: hsl(335, 100%, 50%);
              background-image: url("../img/cat.png"); 
              background-blend-mode: luminosity;
          }

4. Frosted glass effect

Main implementation principle: The background of the content pseudo element is the same as the image of the underlying background; and add filter:blur blur filter. Note that blur cannot be applied to the underlying background, nor can it be applied to the background of the element (this will cause the element itself to be blurred, causing the text to be invisible), and can only be used on

pseudo-elements

.

The code is as follows:

body{
    background: url("../img/cat.png") no-repeat;
    background-size: cover;
}.wrap{
    position: relative;
    width: 500px;
    margin: 0px auto;
    padding: 10px;
    line-height: 1.5;
    background: hsla(0, 0%, 100%, .3);
    overflow: hidden;
}.wrap::before{
    content: '';
    background: url("../img/cat.png") 0/cover fixed;
    position: absolute;
    top: 0; right: 0; bottom: 0; left: 0;
    filter: blur(20px);
    z-index: -1;
    margin: -30px;
}

Code description:

Both body and wrap pseudo-elements are applied The same background image
wrap's background-attachment is set to fixed, so that the background image does not move with the scroll
wrap pseudo-element is set to
• Absolute positioning

  , and the z-index level is only higher than the background

Use blur to set the blur size of the wrap pseudo-element
Use negative margin values ​​to increase the width, and use overflow:hidden for the parent element to hide overflow to make the blurred background more realistic.
5. Corner effect

Implementation steps

First use linear-gradient to achieve corner cutting Effect
Then use linear-gradinet to generate a triangle, and set its position, width and height
The code is as follows:

• .wrap{
          background: linear-gradient(to left bottom, transparent 50%, rgba(0, 0, 0, .4) 0) no-repeat 100% 0/2em 2em,
          linear-gradient(-135deg, transparent 1.4em, #58a 0);
          width: 200px;
          height: 120px;
      }

Note

100% 0/2em 2em in positioning the position and width of background elements, especially 2em The width and height are the normal width of the background element.
The 1.4em in the second linear-gradient is measured along the gradient axis, which is the distance from the gradient axis to the top edge of the element. In this case, it is the gradient axis to the upper right The distance from the top of the edge
to left bottom means that the gradient starts from the lower left corner

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