======================
已经测试过了可以用的Hr样式：
<!--这是一部分-->
<hr style="FILTER: alpha(opacity=100,finishopacity=0,style=3)" width="80%" color=#FFAAEA size=5>
<hr style="FILTER: alpha(opacity=100,finishopacity=0,style=2)" width="80%" color=#FFAAEA size=5>
<hr style="FILTER: alpha(opacity=100,finishopacity=0,style=1)" width="80%" color=#FFAAEA size=5>
<hr style="FILTER: alpha(opacity=0,finishopacity=100,style=1)" width="80%" color=#FFAAEA size=5>
<hr style="FILTER: progid:DXImageTransform.Microsoft.Shadow(color:#987cb9,direction:145,strength:15)" width="80%" color=#FFAAEA size=5>
<hr style="FILTER: progid:DXImageTransform.Microsoft.Glow(color=#987cb9,strength=10)" width="80%" color=#987cb9 size=5>
<!-- 设置两种颜色#FFAAEA 和 #5B45E6 其他 #FF0000 对比一下-->
======================

<!--支持使用Html中的英语单词颜色表示-->
<hr style="height:6px;border:none;border-top:8px dotted red;" />
<hr style="height:6px;border:none;border-top:8px dotted blue;" />
<hr style="height:6px;border:none;border-top:8px dotted yellow;" />
<hr style="height:6px;border:none;border-top:8px dotted orange;" />
<!--支持使用Html中的进制颜色表示-->
<hr style="height:6px;border:none;border-top:8px dashed #FFAAEA;" />
<hr style="height:6px;border:none;border-top:8px solid #FFAAEA;" />
<hr style="height:6px;border:none;border-top:8px double #FFAAEA;" />
<hr style="height:6px;border:none;border-top:8px ridge #FFAAEA;" />
<hr style="height:6px;border:none;border-top:8px groove #FFAAEA;" />