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CSS Properties - Basic Exercises, Practice, Solution

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22. How to specify the size of a background image?

HTML Code:

 <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS background-size Properties</title>
</head>
<body>
</body>
</html>

Try it in the following editor or see the solution.

a. How to set the background image default value?

b. How to set the width and height of the background image?

c. How to sets the width and height of the background image in percent of the parent element?

d. How to scale the background image to be as large as possible so that the background area is completely covered by the background image?

e. How to scale the image to the largest size such that both its width and its height can fit inside the content area?

f. How to sets this property to its initial value?

See the Pen html css common editor by w3resource (@w3resource) on CodePen.


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HTML-CSS: Tips of the Day

Expand a div to fill the remaining width

The solution to this is actually very easy, but not at all obvious. You have to trigger something called a "block formatting context" (BFC), which interacts with floats in a specific way.

Just take that second div, remove the float, and give it overflow:hidden instead. Any overflow value other than visible makes the block it's set on become a BFC. BFCs don't allow descendant floats to escape them, nor do they allow sibling/ancestor floats to intrude into them. The net effect here is that the floated div will do its thing, then the second div will be an ordinary block, taking up all available width except that occupied by the float.

This should work across all current browsers, though you may have to trigger hasLayout in IE6 and 7. I can't recall.

Demos:

  • Fixed Left: http://jsfiddle.net/A8zLY/5/
  • Fixed Right: http://jsfiddle.net/A8zLY/2/
div {
  float: left;
}

.second {
  background: #ccc;
  float: none;
  overflow: hidden;
} 
<div>Tree</div>
<div class="second">View</div>