In basic HTML, is the correct horizontal rule element   or
102428
What tags in HTML5 are acknowledged of being self-closing?
58757
How to float elements left or right of a horizontally centered element?
26927
Is it alright to use multiple h1 tags on the same page, but style them differently?
3229
What's the difference between HTML's and CSS's width attribute?
61950
float:left; vs display:inline; vs display:inline-block; vs display:table-cell;
55205
CSS attribute selectors: The rules on quotes (", ' or none?)
27943
Can a  element's href attribute be relative?
66263
Text: right to left (CSS)
71277
What is that thing between CSS "selectors" called?
103688
Why do the :before and :after pseudo-elements require a 'content' property?
5851
Which characters are valid in CSS class names/selectors?
33182
Basic Coding Standard for HTML and CSS
1212
Are the decimal places in a CSS width respected?
93302
Is it wrong to place the  tag after the  tag?
156221
How to make text vertically and horizontally center in an HTML page
35485
Can I have multiple :before pseudo-elements for the same element?
100837
Vertically centered horizontal rule filling the rest of a line?