CSS Floating: Floats and Float Shapes by Eric A. Meyer

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By Eric A. Meyer

While flowing textual content round photographs is definitely not anything new, with CSS you could waft any aspect, from photos to paragraphs to lists. during this useful advisor, writer Eric Meyer finds a few interesting—and surprising—ways to take advantage of CSS floats on your website design, together with the newest potential to circulation content material earlier non-rectangular glide shapes.

Short and candy, this publication is an excerpt from the impending fourth version of CSS: The Definitive Guide. if you happen to buy both the print or the book version of CSS Floating, you’ll obtain a chit at the whole Definitive Guide as soon as it’s published. Why wait? tips on how to convey lifestyles in your web content now.

  • Learn the features of floated parts, and CSS principles for utilizing them
  • Be conscious of convinced rule exceptions whilst using floats in your layout, together with using damaging margins
  • Use the clear estate to avoid floats from affecting components within the subsequent component to the document
  • Create floating packing containers in non-rectangular shapes, together with rounded corners, circles, ellipses, or even polygons
  • Define glide shapes with obvious or opaque images

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You define a polygonal shape by specifying a comma-separated list of X-Y coordinates, expressed as either lengths or percentages, calculated from the top left of the shape box. Each X-Y pair is a vertex in the polygon. If the first and last vertices are not the same, the browser will close the polygon by connecting them. ) So let’s say we want a diamond shape that’s 50 pixels tall and wide. If we start from the top vertex, the polygon() value would look like this polygon(25px 0, 50px 25px, 25px 50px, 0 25px) Percentages have the same behavior as they do in background-image positioning (for example), so we can define a diamond shape that always “fills out” the shape box, it would be written like so: polygon(50% 0, 100% 50%, 50% 100%, 0 50%) The result of this and the previous polygon example are shown in Figure 1-37.

If you fail to declare a width value for your floated elements, you could end up with something like Figure 1-4. ) Figure 1-4. Floated text without an explicit width No floating at all There is one other value for float besides left and right. float: none is used to prevent an element from floating at all. This might seem a little silly, since the easiest way to keep an element from floating is to simply avoid declaring a float, right? Well, first of all, the default value of float is none. In other words, the value has to exist in order for normal, nonfloating behavior to be possible; without it, all elements would float in one way or another.

1005 Gravenstein Highway North Sebastopol, CA 95472 800-998-9938 (in the United States or Canada) 707-829-0515 (international or local) 707-829-0104 (fax) We have a web page for this book, where we list errata, examples, and any additional information. com/catalog/. com. com. com/oreillymedia Chapter 1. Floating and Shapes For a very long time, floated elements were the basis of all our web layout schemes. ) But floats were never meant for layout; their use as a layout tool was a hack nearly as egregious as the use of tables for layout.

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