If you want to write something in a blog that happens to be HTML code, you can get it to show up by using alternatives to characters.
In the last post, I was trying to write /<microSD>/ as part of an explanation. What I posted was just //. It's because Blogger and the browser interpreted the < > as html code and didn't show it as text.
Why's it showing up here? Because I didn't actually insert a <. What I put in is "& l t ; " and "& g t" (without the spaces and quotation marks). Blogger replaces that set of characters with < and >.
The alternates are Unicode Alternatives for special characters in HTML. That link has a long list of them and explains where and how they work.