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2017/web/core/themes/stable/README.txt

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+
+ABOUT STABLE
+------------
+
+Stable is the default base theme; it provides minimal markup and very few
+CSS classes. If you prefer more structured markup see the Classy base theme.
+
+Stable allows core markup and styling to evolve by functioning as a backwards
+compatibility layer for themes against changes to core markup and CSS. If you
+browse Stable's contents, you will find copies of all the Twig templates and
+CSS files provided by core.
+
+Stable will be used as the base theme if no base theme is set in a theme's
+.info.yml file. To opt out of Stable you can set the base theme to false in
+your theme's .info.yml file (see the warning below before doing this):
+  base theme: false
+
+Warning: Themes that opt out of using Stable as a base theme will need
+continuous maintenance as core changes, so only opt out if you are prepared to
+keep track of those changes and how they affect your theme.
+
+ABOUT DRUPAL THEMING
+--------------------
+
+For more information, see Drupal.org's theming guide.
+https://www.drupal.org/docs/8/theming