Detailed introduction to properties related to css background

In my impression, css only controls the background background, but background is a composite attribute

which includes:

• background -color: background color, color representation methods supported by css, you can use

• background-image: background image (url)

• background-repeat: Whether the background is repeated (repeat, no-repeat, repeat-x, repeat-y)

• background-position: Background positioning (keyword, percentage, pixels)

• ##background-size: Background size

• background-origin：Background positioning area

• background-clip：Background drawing area

• background-attachment: Specifies whether the background image is fixed or scrolls with the rest of the page

 .p{
 background: #000 url("1.jpg") no-repeat left center;/*颜色、图片、是否平铺、定位*/
 }

.div{
        width: 400px;
        height: 200px;
        padding: 20px;
        border:10px solid rgba(255,255,255,.2);
        background: #000 url("1.jpg") no-repeat;
        background-origin:border-box;
        /*background-origin:padding-box;*/
        /*background-origin:content-box;*/
    }

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• border-box

  

• padding-box

  

##content-box

• 

The above is the effect of background-origin, but it seems to be a little different from what I want. There are still background images on the bottom and right sides during padding and content, and it seems that the background color (#000 ) Didn’t work

Supplement: It can determine the starting point of background positioning.

Background positioning area (background-origin): The value is a keyword, and there are also 3

.div{
    width: 400px;
    height: 200px;

    padding: 20px;
    border:10px solid rgba(0,0,0,.1);

    background:#000 url("1.jpg") no-repeat;
    /*background-clip:border-box;*/
    /*background-clip:padding-box;*/
    background-clip:content-box;
}

border-box:

• 

padding-box：

• 

  ##content-box：

• 

  The above is the effect of background-clip, it feels a little better than background-origin, ha.

Now to achieve the above effect, just one p is enough. Link: demo

nbsp;html>


    <meta>
    <title>Title</title>
    <style>
        .div{
            width: 240px;
            height: 150px;
            border:1px solid #000;
            
            background: url("1.jpg") no-repeat left top,
                        url("2.jpg") no-repeat left bottom,
                        url("3.jpg") no-repeat right bottom;
            background-size:100px auto, 100px auto, 100px auto;
        }
    </style>


<div></div>



多个背景

• -webkit-linear-gradient(起点[方向],color1 定位,color2 定位,...,colorN  定位);

• 

 渐变参数-起点：关键字、百分比、像素、角度（逆时针旋转）

 渐变重复：-webkit-repeating-linear-gradient(起点,color1 定位,color2 定位,...,colorN  定位);

径向渐变：参考

• radial-gradient(position,shape,size,color);

• position:定义径向渐变的圆心位置

• shape:定义径向渐变的形状

• size：确定径向渐变的结束形状大小

• color：颜色　

• 

• 

• 

• 图中的at前的2个值是渐变大小（就是控制渐变形状的），at后的两个值是圆心

   

 重复径向渐变：repeating-radial-gradient

遮罩：-webkit-mask

div{
    /* 要配合背景使用 */
    background:url("1.jpg") no-repeat 50% 50%/100% 100%;
    -webkit-mask: url(1.png) 30px 10px/10px 10px;
}

nbsp;html>


    <meta>
    <title>Title</title>
    <style>

        body{
            background: #000;
        }
        div{
            width: 400px;
            height: 300px;
            border:12px solid #000;/* 没起作用 */
            background:url("1.jpg") no-repeat 50% 50%/100% 100%;
            -webkit-mask: url(1.png) 30px 10px/10px 10px;
        }
    </style>


<div></div>

 图片大小：background-size

• 关键字：cover 等比缩放，保证填满容器，（配合背景定位，就实现图片居中了）

• 关键字：contain 等比缩放，容器可能会有缝隙

• 数值：x-控制图片宽， y-控制图片高

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