Miniscule details that matter to me.
Ellipsis character
The ellipsis is not the same as three full stops and it's a problem for assistive technology if you fail to use the correct character 😮.
I'm actually quite angry with myself for not knowing this since I've been using three consecutive periods for this purpose frequently for years.
Oh well… one lives and learns.
… is the html code to use.
alt+0151 is the code on a numeric keypad — I'm not sure what to do on a reduced keyboard.
Em dash
Same sort of thing — — is the HTML and alt+0133 is the numeric code.