In short, Smart Paste allows you to
On iOS, select the text you wish to add to your website. Tap “Action…” on the menu, select “Copy…” and then “As HTML”. Paste the text into your website/editor.
On Mac, simply make use of the "Copy as › HTML" command in the Edit menu.
If you work on Mac or with a keyboard attached to your iPad or iPhone, you can speed things up with the following shortcuts: