The selectors here are specific to Wufoo markup, but the concepts at work can work for any form. The overall idea is that you make the default radio buttons and checkboxes invisible by setting their opacity to zero, and replace them with graphics. Then use the :checked selector to alternate the graphics between their checked and unchecked versions.

/* 
    Hide the original radios and checkboxes
    (but still accessible)
    
    :not(#foo) > is a rule filter to block browsers
                 that don't support that selector from
                 applying rules they shouldn't
       
*/
li:not(#foo) > fieldset > div > span > input[type='radio'], 
li:not(#foo) > fieldset > div > span > input[type='checkbox'] {
    
    /* Hide the input, but have it still be clickable */
    opacity: 0;
    
    float: left;
    width: 18px;
}


li:not(#foo) > fieldset > div > span > input[type='radio'] + label,
li:not(#foo) > fieldset > div > span > input[type='checkbox'] + label {
    margin: 0;
    clear: none;
    
    /* Left padding makes room for image */
    padding: 5px 0 4px 24px;

    /* Make look clickable because they are */
    cursor: pointer;
    
    background: url(off.png) left center no-repeat; 
}

/*
    Change from unchecked to checked graphic
*/
li:not(#foo) > fieldset > div > span > input[type='radio']:checked + label {
    background-image: url(radio.png);
}
li:not(#foo) > fieldset > div > span > input[type='checkbox']:checked + label {
    background-image: url(check.png);
}

Reference URL

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tbody tr:nth-child(odd) {
   background-color: #ccc;
}

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HTML

You can make them with a single div. It's nice to have classes for each direction possibility.

<div class="arrow-up"></div>
<div class="arrow-down"></div>
<div class="arrow-left"></div>
<div class="arrow-right"></div>

CSS

The idea is a box with zero width and height. The actual width and height of the arrow is determined by the width of the border. In an up arrow, for example, the bottom border is colored while the left and right are transparent, which forms the triangle.

.arrow-up {
	width: 0; 
	height: 0; 
	border-left: 5px solid transparent;
	border-right: 5px solid transparent;
	
	border-bottom: 5px solid black;
}

.arrow-down {
	width: 0; 
	height: 0; 
	border-left: 20px solid transparent;
	border-right: 20px solid transparent;
	
	border-top: 20px solid #f00;
}

.arrow-right {
	width: 0; 
	height: 0; 
	border-top: 60px solid transparent;
	border-bottom: 60px solid transparent;
	
	border-left: 60px solid green;
}

.arrow-left {
	width: 0; 
	height: 0; 
	border-top: 10px solid transparent;
	border-bottom: 10px solid transparent; 
	
	border-right:10px solid blue; 
}

Examples

Dave Everitt writes in:

For an equilateral triangle it's worth pointing out that the height is 86.6% of the width so (border-left-width + border-right-width) * 0.866% = border-bottom-width

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Regular text shadow:

p { text-shadow: 1px 1px 1px #000; }

Multiple shadows:

p { text-shadow: 1px 1px 1px #000, 3px 3px 5px blue; }

The first two values specify the length of the shadow offset. The first value specifies the horizontal distance and the second specifies the vertical distance of the shadow. The third value specifies the blur radius and the last value describes the color of the shadow:

1. value = The X-coordinate
2. value = The Y-coordinate
3. value = The blur radius
4. value = The color of the shadow

Using positive numbers as the first two values ends up with placing the shadow to the right of the text horizontally (first value) and placing the shadow below the text vertically (second value).

The third value, the blur radius, is an optional value which can be specified but don’t have to. It’s the amount of pixels the text is stretched which causes a blur effect. If you don’t use the third value it is treated as if you specified a blur radius of zero.

Also, remember you can use RGBA values for the color, for example, a 40% transparency of white:

p { text-shadow: 0px 2px 2px rgba(255, 255, 255, 0.4); }

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One big reason to use image preloading is if you want to use an image for the background-image of an element on a mouseOver or :hover event. If you only apply that background-image in the CSS for the :hover state, that image will not load until the first :hover event and thus there will be a short annoying delay between the mouse going over that area and the image actually showing up.

Technique #1

Load the image on the element's regular state, only shift it away with background position. Then move the background position to display it on hover.

#grass { background: url(images/grass.png) no-repeat -9999px -9999px; }
#grass:hover { background-position: bottom left; }

Technique #2

If the element in question already has a background-image applied and you need to change that image, the above won't work. Typically you would go for a sprite here (a combined background image) and just shift the background position. But if that isn't possible, try this. Apply the background image to another page element that is already in use, but doesn't have a background image.

#random-unsuspecting-element { background: url(images/grass.png) no-repeat -9999px -9999px; }
#grass:hover { background: url(images/grass.png) no-repeat; }

The idea create new page elements to use for this preloading technique may pop into your head, like #preload-001, #preload-002, but that's rather against the spirit of web standards. Hence the using of page elements that already exist on your page.

I had the idea to try to and use the same element, only use the :after pseduo-class to load the image, so you didn't need to rely on there being enough extraneous background-free images on your page to work with, but for whatever reason didn't want to preload them properly.

More

Check this article out for some more techniques, including JavaScript.

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Firefox 2

html>/**/body .selector, x:-moz-any-link {
  color:lime;
}

Firefox 3

html>/**/body .selector, x:-moz-any-link, x:default {
  color:lime;
}

Any Firefox

@-moz-document url-prefix() { 
  .selector {
     color:lime;
  }
}

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Sans-Serif

Arial, sans-serif;
Helvetica, sans-serif;
Gill Sans, sans-serif;
Lucida, sans-serif;
Helvetica Narrow, sans-serif;
sans-serif;

Serif

Times, serif;
Times New Roman, serif;
Palatino, serif;
Bookman, serif;
New Century Schoolbook, serif;
serif;

Monospace

Andale Mono, monospace;
Courier New, monospace;
Courier, monospace;
Lucidatypewriter, monospace;
Fixed, monospace;
monospace;

Cursive

Comic Sans, Comic Sans MS, cursive;
Zapf Chancery, cursive;
Coronetscript, cursive;
Florence, cursive;
Parkavenue, cursive;
cursive;

Fantasy

Impact, fantasy;
Arnoldboecklin, fantasy;
Oldtown, fantasy;
Blippo, fantasy;
Brushstroke, fantasy;
fantasy;

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