DAHLIA Pattern Library

Triangle 

<div>
    <div class="dahlia-pl-triangle"></div>
    <div class="dahlia-pl-triangle-large margin-top"></div>
</div>
 
<div>
  <div class="dahlia-pl-triangle"></div>
  <div class="dahlia-pl-triangle-large margin-top"></div>
</div>
 
{
  "utilities": {
    "padding": [
      "padding--half",
      "padding-top--half",
      "padding-right--half",
      "padding-bottom--half",
      "padding-left--half",
      "padding",
      "padding-top",
      "padding-right",
      "padding-bottom",
      "padding-left",
      "padding--3halves",
      "padding-top--3halves",
      "padding-right--3halves",
      "padding-bottom--3halves",
      "padding-left--3halves",
      "padding--2x",
      "padding-top--2x",
      "padding-right--2x",
      "padding-bottom--2x",
      "padding-left--2x"
    ],
    "margin": [
      "margin--half",
      "margin-top--half",
      "margin-right--half",
      "margin-bottom--half",
      "margin-left--half",
      "margin-top",
      "margin-right",
      "margin-bottom",
      "margin-left",
      "margin--3halves",
      "margin-top--3halves",
      "margin-right--3halves",
      "margin-bottom--3halves",
      "margin-left--3halves",
      "margin--2x",
      "margin-top--2x",
      "margin-right--2x",
      "margin-bottom--2x",
      "margin-left--2x"
    ],
    "border-radius": [
      "radius",
      "radius-bottom"
    ],
    "border": [
      "border-bottom",
      "border-top",
      "border-left",
      "border-right",
      "border-bottom--primary",
      "border-top--primary",
      "border-left--primary",
      "border-right--primary",
      "no-border"
    ],
    "abs-position": [
      "a-top-right",
      "a-top-left",
      "a-bottom-right",
      "a-center"
    ]
  }
}

.dahlia-pl-triangle and .dahlia-pl-triangle-large are just sample classes (not actually used in the pattern library) that implement the triangle() mixin to create CSS based triangles. The mixin accepts a $border-width argument which will define the size of the triangle.