Home Web Front-end HTML Tutorial 前端新人学习笔记-html/css/js基础知识点(三)_html/css_WEB-ITnose

前端新人学习笔记-html/css/js基础知识点(三)_html/css_WEB-ITnose

Jun 24, 2016 am 11:20 AM

这断时间家里有点事,上班也有点任务,所以几天没看视频没来更新了。今天来更新一下了。

一:默认样式重置

      但凡是浏览默认的样式,都不要使用。

      body,p,h1,h2,h3,h4,h5,h6,dl,dd{margin:0; font-size:12px;/* font-family:XX; */}
      ol,ul{list-style:none;padding:0;margin:0;}
      a{text-decoration:none;}
      img{border:none;}

二:块元素和内嵌元素

      块元素的特征:

          1.默认独占一行;

          2.没有宽度时,默认撑满一排;

          3.支持所有css命令;

       内联元素的特征:

           1.同类的标签可以在同排显示;

           2.不支持宽高;

           3.内容撑开宽度;

           4.不支持上下的margin和padding;

           5.代码换行被解析;

三:块元素和内嵌元素的转换

         display:block   使内联元素具备块属性标签的特性;

         display:inline   使块元素具备内嵌元素的特性。

         display:inline-block

             特性:1.块在一行显示;

                      2.行内属性标签支持宽高;

                      3.没有宽度的时候内容撑开;

             问题:1.代码换行被解析;

                      2.ie6,7不支持块属性标签的inline-block;

四:浮动

     1.块在一排显示;

     2.内联元素也支持宽高了;

     3.默认内容撑开宽度;

     4.脱离文档流;

     5.提升层级半层

        

wo shi div

         这个时候div标签就和里面的内容位于同一层级了。




box1

box2

这个时候会出现这样的现象,这就和提升了半个层级有关。

 

 

    

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