Creating Triangle Arrows in pure CSS

courtesy:
http://hedgerwow.appspot.com/demo/arrows

 The old spice come back with a new flavor.
I was reading an interesting post(in chinese) about how to enable the transparent border in IE, and I thought it's worthy to spread this technique to more people. So below is my take.
This trick does not require using filter: chroma(color=pink) for IE.

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Examples

The quick brown fox jumps over the lazy dog
The quick brown fox jumps over the lazy dog

HTML

<span class="arrow-n"></span> <span class="arrow-e"></span> <span class="arrow-s"></span> <span class="arrow-w"></span>

CSS

.arrow-n,
.arrow-e,
.arrow-s,
.arrow-w {
  /*
   * In Internet Explorer, The"border-style: dashed" will never be
   * rendered unless "(width * 5) >= border-width" is true.
   * Since "width" is set to "0", the "dashed-border" remains
   * invisible to the user, which renders the border just like how
   * "border-color: transparent" renders.
   */
  border-style: dashed;
  border-color: transparent;
  border-width: 0.53em;
  display: -moz-inline-box;
  display: inline-block;
  /* Use font-size to control the size of the arrow. */
  font-size: 100px;
  height: 0;
  line-height: 0;
  position: relative;
  vertical-align: middle;
  width: 0;
}

.arrow-n {
  border-bottom-width: 1em;
  border-bottom-style: solid;
  border-bottom-color: #666;
  bottom: 0.25em;
}

.arrow-e {
  border-left-width: 1em;
  border-left-style: solid;
  border-left-color: #666;
  left: 0.25em;
}
                    
.arrow-s {
  border-top-width: 1em;
  border-top-style: solid;
  border-top-color: #666;
  top: 0.25em;
}

.arrow-w {
  border-right-width: 1em;
  border-right-style: solid;
  border-right-color: #666;
  right: 0.25em;
}