Add basic property-value utils for position

docs/4.0/utilities/position.md

@@ -6,6 +6,18 @@ group: utilities
 toc: true
 ---
 
+## Common values
+
+Quick positioning classes are available, though they are not responsive.
+
+{% highlight html %}
+<div class="position-static">...</div>
+<div class="position-relative">...</div>
+<div class="position-absolute">...</div>
+<div class="position-fixed">...</div>
+<div class="position-sticky">...</div>
+{% endhighlight %}
+
 ## Fixed top
 
 Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add aditional CSS.

scss/utilities/_position.scss

@@ -1,4 +1,13 @@
-// Positioning
+// Common values
+
+// Sass list not in variables since it's not intended for customization.
+$positions: static, relative, absolute, fixed, sticky;
+
+@each $position in $positions {
+  .position-#{$position} { position: $position !important; }
+}
+
+// Shorthand
 
 .fixed-top {
   position: fixed;