Have you ever used these css properties?

Question

When are they useful?

table-layout
font-stretch
font-size-adjust
orphans and widows
marks
clip

Answer 1

orphans and widows are commonly used in print to avoid a single line at the bottom or top of the page.

More information can be found here, just do a quick search
http://www.w3schools.com/Css/pr_tab_table-layout.asp

Answer 2

table-layout: fixed , . , table-layout: fixed, <col> , . .

, , . : http://www.ibloomstudios.com/articles/misunderstood_css_clip/

, , . / . , - , table-layout .