What are the precautions when using H5 in enterprise development?

This time I will bring you what are the precautions for using H5 in enterprise development. What are the precautions for using H5 in enterprise development? The following is a practical case, let's take a look. 3 In enterprise development, if we want to align the tops of multiple boxes, we can make multiple boxes float at the same time; or make them align at the top through positioning fine-tuning;

3. In enterprise development, first write the following code in css:

       /*1.清空默认边距*/
        body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td{            margin:0;padding:0
        }        /*2.清空默认样式*/
        a{            text-decoration: none;            color: #ccc;
        }        ul, ol{            list-style: none;
        }        /*3.利用body设置整个界面的文字信息
        文字大小 文字字体 文字颜色
        */
        body{            font-size:12px;            font-family:"宋体";            color: #333;
        }

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