First commit.

sass/components/print-none/_print-none.scss

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+// Do not print
+//
+// Removes an element from the print version of the web site.
+//
+// By importing these CSS rules in a file marked as media "all", we allow these
+// print rules to be aggregated with other stylesheets, for improved front-end
+// performance.
+//
+// Markup: print-none.twig
+//
+// Style guide: components.print-none
+
+.print-none,
+%print-none {
+  @media print {
+    display: none;
+  }
+}
+
+//
+// Drupal selectors.
+//
+
+// Hide Drupal nav elements.
+.toolbar,
+.action-links,
+.links,
+.book-navigation,
+.forum-topic-navigation,
+.feed-icons {
+  @extend %print-none;
+}

sass/components/print-none/print-none.twig

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+<p class="print-none">
+  This item will not be printed.
+</p>