CSS hacks you may not know

This is a collection of short CSS snippets I thought might be useful for beginners. If you’re experienced with CSS you’ll have seen most of these tips and tricks before, but who knows maybe you can find one or two you haven’t seen before.

• Unicode classes

You can use unicode characters for class names in your HTML, and even use write CSS selectors with those same characters.

.♫ { background: #222; color: #FFF; } 
.ಠ_ಠ { background: #ccc; color: #fff; }

• Remove input outline for WebKit browsers

input[type="text"]:focus { outline: none; }

And orange outline won’t show up anymore.

• Opacity in all major browsers

As you know older browsers have different ways of controlling the opacity or transparency.

div { opacity:0.4; -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)"; /* IE8 */ filter: alpha(opacity=40); /* IE 5-7 */ }

• Property text-decoration is now a shorthand

a { text-decoration: overline red wavy; }

Currently works only in Firefox.

• Background new values

Correct syntax for all background properties is:

div { background: [background-image] 
                  [background-position] 
                  [/ background-size] 
                  [background-repeat] 
                  [background-attachment] 
                  [background-origin] 
                  [background-clip] 
                  [background-color]; 
}

• Specifying page breaks for printing using CSS

.page-break { page-break-before: always; }
p { text-transform: capitalize; }

• Consistent base font size

body { font-size:62.5%; }

Setting the font-size property to 62.5% in body makes 1em equal to 10px.

• Reading HTML attribute values from CSS

a:hover:after { content: attr(title); }

• A one-liner to target Webkit browsers

.selector:not(*:root) { property:value; }

• A Media Query to target Webkit browsers

@media screen and (-webkit-min-device-pixel-ratio:0) { 
                     .selector { property:value; 
} }

• Target old versions of Internet Explorer

Easily target IE8 and older versions. Yes, I know it’s 2015, but I recently used this hack :D

.element { color: black; 
           color: green\9; /* IE8 and older */ 
           *color: blue; /* IE7 and older */ 
           _color: red; /* IE6 and older */ }

• Add a left margin of 10px to all paragraphs in all browsers (except Opera 9 and below)

p { margin-left: 10px; } html:first-child p { margin-left: 0; }

P.S. If you know of any other good ones, please contact me via twitter.