Examining some CSS code and came across this:
.head{
position:relative;
overflow:hidden;
margin:-30px 0 0 -25px;
width:820px;
padding:20px 25px 0 25px;
background:url(/images/bkg.gif) 0 0 no-repeat;
}
What's the reason behind using -30px and -25px margins?
After starting my answer, I stumbled upon a much more comprehensive one here (Wayback Machine backup). Here are some key points:
Regarding negative margins:
Their impact on unfloated elements:
Their effect on floated elements:
Examples in the article showcase the versatility of negative margins (like the 3-column layout). I've used a similar technique for layout adjustments. Typically, they are used to fine-tune element positions or create visual overlaps.
There are many creative techniques and beautiful effects that utilize negative margins:
Font Image Swap - for those times when you're attached to a specific font but still want to use it, image replacement comes to the rescue. By applying negative margins, the regular font is pushed aside to make way for the "picture" font.
Image Hover Borders - by adding negative margins to an image equal to the size of the border, you can prevent the image and layout from shifting during a rollover effect.
Centering Objects - with the help of negative margins matching the dimensions of an object, you can effortlessly center it on the screen, creating a visually pleasing effect.
Using negative margins can come in handy when you need to create space around elements or apply padding to surrounding elements. I find myself using this technique frequently, and you can learn more about it by visiting this link:
There is a unique scenario where negative margins are the perfect solution:
Imagine wanting a portion of a box to extend beyond the parent element, including the padding. Instead of removing the parent's padding and applying it individually to all children except for the special case, negative margins can be used. This eliminates the need for complex positioning and enhances readability.
Take a look at this example: http://codepen.io/anon/pen/DpHvu
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