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doc/modules/base/Visibility.md

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+# Base/Block
+
+## Definition
+
+This library provides several helper utilities related to visibility. The
+classes described in this module may be applied to any element and define
+visibility unless the element is already hidden by a parent element.
+
+## Usages
+
+The `Base/Visibility/Hide` library provides a helper that sets visibility to
+none for all devices. This is useful in the context of Javascript by adding and
+removing this class to change visibility. An alternative might be using the
+`display:none` property such as in jQuery.
+
+The `Base/Visibility/Responsive/Show` library provides helpers that set visibility
+to none for devices with viewport dimensions that **do** meet the breakpoints
+specified as `$base-breakpoint-small` and `$base-breakpoint-medium`.
+
+The `Base/Visibility/Responsive/Show` library provides helpers that set visibility
+to none for devices with viewport dimensions that **don't** meet the breakpoints
+specified as `$base-breakpoint-small` and `$base-breakpoint-medium`.
+
+## Features
+
+### Base/Visibility/Hide
+
+* `.hide` applies left-alignment to text
+
+### Base/Visibility/Responsive/Hide
+
+* `.hide-small` hides the element on all devices smaller than `$base-breakpoint-small`
+* `.hide-medium` hides the element on all devices smaller than `$base-breakpoint-medium` and at least as large as `$base-breakpoint-small`
+* `.hide-large` hides the element on all devices at least as large as `$base-breakpoint-medium`
+
+### Base/Visibility/Responsive/Show
+
+* `.show-small` shows the element on all devices smaller than `$base-breakpoint-small`
+* `.show-medium` shows the element on all devices smaller than `$base-breakpoint-medium` and at least as large as `$base-breakpoint-small`
+* `.show-large` shows the element on all devices at least as large as `$base-breakpoint-medium`
+
+## Responsive Considerations
+
+All visibility classes in `Base/Visibility/Responsive` relate visibility of an
+element to