How to make sharp corners in css3

How to make sharp corners in css3: First create an HTML sample file; then determine the position of the sharp corners; finally, set the attributes of the specified div to "top:6px;left:-3px;border-top:0px ;border-bottom..." to achieve the sharp corner effect.

The operating environment of this tutorial: windows7 system, css3 version, thinkpad t480 computer.

Recommended: "css video tutorial"

The sharp corners are on top

Rendering:

##Code:

##

<title>尖角p</title>
<style>
#top
{
  width:400px;
  height:250px;
  border:3px solid;   /* 边框宽度为3px */
  position:relative;
}
.sp1,.sp2
{
  display:block;
  height:0px;
  width:0px;
  position:absolute;
  font-size:0;
  line-height:0;
}
.sp1
{
  top:-9px;    /* 它的绝对值加上span的边框宽度等于p边框宽度的5倍 */
  left:40px;   /* 它来确定尖角的位置 */
  border-top:0px;
  border-bottom:6px solid black;  /* 注意颜色的变化 */
  border-right:6px solid white;
  border-left:6px solid white;
}
.sp2
{
  top:6px;  /* 是自身边框宽度的2倍 */
  left:-3px; /* 是自身边框宽度的-1倍  */
  border-top:0px;
  border-bottom:3px solid white;
  border-right:3px solid black;
  border-left:3px solid black;
}

</style>



<p>
<span>
<span></span>
</span>
</p>

The sharp corners are underneath

Rendering:

##Code:

##

<title>尖角p</title>
<style>
#bottom
{
  width:400px;
  height:250px;
  border:3px solid;   /* 边框宽度为3px */
  position:relative;
}
.sp1,.sp2
{
  display:block;
  height:0px;
  width:0px;
  position:absolute;
  font-size:0;
  line-height:0;
}
.sp1
{
  bottom:-9px;    /* 它的绝对值加上span的边框宽度等于p边框宽度的5倍 */
  left:40px;   /* 它来确定尖角的位置 */
  border-bottom:0px;
  border-top:6px solid black;  /* 注意颜色的变化 */
  border-right:6px solid white;
  border-left:6px solid white;
}
.sp2
{
  bottom:6px;  /* 是自身边框宽度的2倍 */
  left:-3px; /* 是自身边框宽度的-1倍  */
  border-bottom:0px;
  border-top:3px solid white;
  border-right:3px solid black;
  border-left:3px solid black;
}

</style>



<p>
<span>
<span></span>
</span>
</p>

The sharp corner is on the left
Rendering:

Code:

<title>尖角p</title>
<style>
#left
{
  width:400px;
  height:250px;
  border:3px solid;   /* 边框宽度为3px */
  position:relative;
}
.sp1,.sp2
{
  display:block;
  height:0px;
  width:0px;
  position:absolute;
  font-size:0;
  line-height:0;
}
.sp1
{
  left:-9px;    /* 它的绝对值加上span的边框宽度等于p边框宽度的5倍 */
  top:40px;   /* 它来确定尖角的位置 */
  border-left:0px;
  border-top:6px solid white;  /* 注意颜色的变化 */
  border-right:6px solid black;
  border-bottom:6px solid white;
}
.sp2
{
  left:6px;  /* 是自身边框宽度的2倍 */
  top:-3px; /* 是自身边框宽度的-1倍  */
  border-left:0px;
  border-top:3px solid black;
  border-right:3px solid white;
  border-bottom:3px solid black;
}

</style>



<p>
<span>
<span></span>
</span>
</p>

The sharp corner is on the right
Rendering :

#Code:

##

<title>尖角p</title>
<style>
#right
{
  width:400px;
  height:250px;
  border:3px solid;   /* 边框宽度为3px */
  position:relative;
}
.sp1,.sp2
{
  display:block;
  height:0px;
  width:0px;
  position:absolute;
  font-size:0;
  line-height:0;
}
.sp1
{
  right:-9px;    /* 它的绝对值加上span的边框宽度等于p边框宽度的5倍 */
  top:40px;   /* 它来确定尖角的位置 */
  border-right:0px;
  border-top:6px solid white;  /* 注意颜色的变化 */
  border-bottom:6px solid white;
  border-left:6px solid black;
}
.sp2
{
  right:6px;  /* 是自身边框宽度的2倍 */
  top:-3px; /* 是自身边框宽度的-1倍  */
  border-right:0px;
  border-top:3px solid black;
  border-bottom:3px solid black;
  border-left:3px solid white;
}

</style>



<p>
<span>
<span></span>
</span>
</p>

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