Ah, I get it now. There's a two-button toggle: 'code/design'. Pressing 'code' allows you to type in HTML. I think 'design' should be renamed 'preview' because I

Ah, I get it now. There's a two-button toggle: 'code/design'. Pressing 'code' allows you to type in HTML. I think 'design' should be renamed 'preview' because I can't edit in design mode (on Chrome but should that make a difference?). So yeah, if I'm going to be typing HTML, I'll likely do it with my own editor.