细节注意
盒子：border-box | padding-box | content-box用于background-origin背景的开始和background-clip的剪切位置。渐变也是生成一张图片相当url(),可以在前面或者后面加 repeat background-size其他等多层背景，最后加背景颜色哦，当然其他也能加，但是前面加的就覆盖最后的了。例子：240px 120px/100% 200px，这里面的背景开始位置position/背景尺寸size都是x和y方向，可以负值，可以百分比（以当前div的宽高，而不是背景图片的宽高的百分比）。position和origin开始位置的区分文档：
doyue的手册
代码：<!DOCTYPE html><html><head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>JS Bin</title> <style> div{display:relative;float:left;} .box0{width:100px;height:100px;background:red;opacity:0.1; transition:height 5s, width ,5s;}.box0:hover{ background:blue;width:200px;opacity:1;height:300px;} .box1{ width:100px;height:230px;/*opacity:0.1; */ background:url("http://images.cnblogs.com/cnblogs_com/leee/801892/o_like.png"); /*background-size:contain; *//*将背景图像等比缩放到宽度或高度与容器的宽度或高度相等，背景图像始终被包含在容器内。*/ /* background-size:cover;*/ /*将背景图像等比缩放到完全覆盖容器，背景图像有可能超出容器。y轴方向北京图片显示完全，*/ /*background-size:100% 100%; *//*自定义背景图像宽高,为当前div宽高的百分比，如果小于div宽高，背景重复，需要设置repeat*/ /*background-size:100% 50%; */ /* background-size:100px 70px; *//*自定义背景图像大小，xy的大小，如果小于div宽高，背景重复，需要设置repeat*/ background-size:30px 70px; transition:1s; /*border:5px solid red;*//*没有顺序哦~*/ border:red solid 5px; /*font:italic small-caps bold 16px/1 Simsun,arial,sans-serif;*/ } .box1:hover{opacity:0.3;} .box2{ height:400px;width:400px; border:4px solid orange; background:url(http://pic36.nipic.com/20131125/8821914_113934565000_2.jpg) 0 0/130px 140px no-repeat, no-repeat url(http://images.cnblogs.com/cnblogs_com/leee/801892/o_like.png) 100px 100px/130px 250px , no-repeat url("http://www.pp3.cn/uploads/201605/20160514011.jpg") 240px 120px/100% 100%,/*100% 100%超过了*/ no-repeat url("http://www.pp3.cn/uploads/201605/20160514011.jpg") 190px -10px/180px 150px , -webkit-linear-gradient(bottom,yellow,yellowgreen) 0 0/100% 100%;/*渐变生成一张图,就相当于url()~*/ } .box3{ height:400px;width:400px; border:4px solid orange; background:url(http://pic36.nipic.com/20131125/8821914_113934565000_2.jpg) 0 0/130px 140px no-repeat,/*没有顺序哦~*/ no-repeat url(http://images.cnblogs.com/cnblogs_com/leee/801892/o_like.png) 100px 100px/130px 250px , url("http://www.pp3.cn/uploads/201605/20160514011.jpg") no-repeat 240px 120px/100% 100%, no-repeat url("http://www.pp3.cn/uploads/201605/20160514011.jpg") 190px -10px/180px 150px green; /*注意，red 只能设置一次，且由于写在前面的背景会叠在之后的背景之上，所以背景色通常都定义在最后一组上，避免背景色将图像盖住。*/ } .box4{ height:400px;width:400px; padding-bottom:10px;/*剪切的时候，padding-box，就是padding也显示背景*/ border:40px dotted orange; margin:50px; background: no-repeat url(http://images.cnblogs.com/cnblogs_com/leee/801892/o_like.png) 100px 100px/130px 100% border-box padding-box; /*background-origin：border-box | padding-box | content-box*/ /*从border/padding/content区域（含border/padding/content）开始显示背景图像。 */ /*background-clip：border-box | padding-box | content-box | text 从border/padding/content区域（不含border/padding/content）开始向外裁剪背景。 */ } </style></head><body><div class="box0"></div> <div class="box1">这是一段字体</div> <div class="box2"></div> <div class="box3"></div> <div class="box4"></div></body></html 结果1 结果2
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Why are HTML tags important for web development?May 02, 2025 am 12:03 AMHTMLtagsareessentialforwebdevelopmentastheystructureandenhancewebpages.1)Theydefinelayout,semantics,andinteractivity.2)SemantictagsimproveaccessibilityandSEO.3)Properuseoftagscanoptimizeperformanceandensurecross-browsercompatibility.
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