New answers tagged wiki
The following tutorial will help you learn how to create wiki pages on a team site. Work with editing tools to format text; change the layout; and insert links, media, and Web Parts. https://support.office.com/en-nz/article/SharePoint-pages-II-Work-with-wiki-pages-affe755a-7013-4393-8444-93ffa9e2c1e2
I encountered this problem and found it was being caused by a different reason. When viewing the raw html for the page, a span element was inserted in the middle of my tag which was causing the Sharepoint Page to understand it as text. After removing the hidden span element, the tag properly generated on save.
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