I have gathered more information let me explain again. When I add this html in the html view: <a href="mailto:firstname.lastname@example.org">email@example.com</a>
Then when switching to 'Design' view the text doesn't appear, however when hovering over it shows fine. I have attached 3 screenshots, namely: Screenshot1 not displaying, Screenshot2 displaying when hovering over, Screenshot3 html string.
I'm running ASP.NET 4.6.2 with Telerik RadEditor v2016.2.607.45