The original text (it has been updated) at https://mathematica.stackexchange.com/editing-help said:
Like code blocks, code spans will be displayed in a monospaced font. Markdown and HTML will not work within them. Note that, [unlike] code blocks, code spans require you to manually escape any HTML within!
I cannot understand what's the word unlike referring to, and the meaning of manually escape any HTML within.
In my present knowledge of 'manually escape HTML within' is to remove manually, however we should manually remove both in code blocks and code spans in the example above. So where I went wrong in comprehending this sentence?