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I added the php filter from admin/config/content/forma<wbr />ts/full_ht<wbr />ml. &nbsp;It now accepts all code. &nbsp;Thanks.
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I added the php filter from admin/config/content/formats/full_html.  It now accepts all code.  Thanks.

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See image attached. &nbsp;When I save the ul id=manufactureMenu it saves the code properly. &nbsp;However, when I go back and edit the code (ie. to add another link, etc..) the id=manufactureMenu is gone and all that is left is the ul tag.<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/01_w05/1078628/drupal.png" target="_blank" class="file-inline" title="see id selector (90 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>drupal.png</a>
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drupal.png

See image attached.  When I save the ul id=manufactureMenu it saves the code properly.  However, when I go back and edit the code (ie. to add another link, etc..) the id=manufactureMenu is gone and all that is left is the ul tag.

Drupal Source editor using full html is not saving id selector.

Drupal is an open-source content-management framework written in PHP used as a back-end framework for websites and is also used for knowledge management and business collaboration. The standard release of Drupal contains basic features common to content management systems, including user account registration and maintenance, menu management, RSS feeds, taxonomy, page layout customization, and system administration. Drupal runs on any computing platform that supports both a Web server capable of running PHP and a database to store content and configuration.

Drupal

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Web Development

Content management (CM) is a set of processes and technologies that supports the collection, managing, and publishing of information in any form or medium. When stored and accessed via computers, this information may be more specifically referred to as digital content, or simply as content. Digital content may take the form of text (such as electronic documents), multimedia files (such as audio or video files), or any other file type that follows a content lifecycle requiring management.