Added.

Author: bert-github

COPYING

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+W3C SOFTWARE AND DOCUMENT LICENSE
+
+https://www.w3.org/Consortium/Legal/2023/software-license
+
+This work is being provided by the copyright holders under the
+following license. License
+
+By obtaining and/or copying this work, you (the licensee) agree that
+you have read, understood, and will comply with the following terms
+and conditions.
+
+Permission to copy, modify, and distribute this work, with or without
+modification, for any purpose and without fee or royalty is hereby
+granted, provided that you include the following on ALL copies of the
+work or portions thereof, including modifications:
+
+ 1. The full text of this NOTICE in a location viewable to users of
+     the redistributed or derivative work.
+
+ 2. Any pre-existing intellectual property disclaimers, notices, or
+    terms and conditions. If none exist, the W3C Software and Document
+    Short Notice (see
+    https://www.w3.org/Consortium/Legal/2023/copyright-software-short-notice)
+    should be included.
+
+ 3. Notice of any changes or modifications, through a copyright
+    statement on the new code or document such as "This software or
+    document includes material copied from or derived from [title and
+    URI of the W3C document]. Copyright © [$year-of-document] World
+    Wide Web Consortium.
+    https://www.w3.org/Consortium/Legal/2023/doc-license"
+
+Disclaimers
+
+THIS WORK IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE NO
+REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
+LIMITED TO, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY
+PARTICULAR PURPOSE OR THAT THE USE OF THE SOFTWARE OR DOCUMENT WILL
+NOT INFRINGE ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER
+RIGHTS.
+
+COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL
+OR CONSEQUENTIAL DAMAGES ARISING OUT OF ANY USE OF THE SOFTWARE OR
+DOCUMENT.
+
+The name and trademarks of copyright holders may NOT be used in
+advertising or publicity pertaining to the work without specific,
+written prior permission. Title to copyright in this work will at all
+times remain with copyright holders.