By Eric A. Meyer
The Grid structure spec will quickly switch your method of web design, yet there'll nonetheless be lots of makes use of for CSS positioning tips. even if you need to create sidebars that stay within the viewport (browser window), upload sticky part headings to lists or lengthy articles, or overlap one aspect with one other, this concise book will expertly advisor you thru all of the major CSS positioning forms. brief and deep, this ebook is an excerpt from the impending fourth variation of CSS: The Definitive advisor. for those who buy both the print or the booklet version of Positioning in CSS, you are going to obtain a chit at the whole Definitive consultant as soon as it truly is published. Why wait? Make your websites come alive this day.
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Extra info for Positioning in CSS: Layout Enhancements for the Web
Also, if an absolutely positioned element’s size is overconstrained in the vertical direc‐ tion, bottom is ignored. Thus, in the following situation, the declared value of bottom would be overridden by the calculated value of 5em:
There is no provision for top to be ignored if the properties are overconstrained.
As with nonreplaced elements, if the values are overconstrained, then the user agent is supposed to ignore the value for bottom. info | 27 Figure 23. Stretching replaced elements through positioning Placement on the z-axis With all of the positioning going on, there will inevitably be a situation where two elements will try to exist in the same place, visually speaking. Obviously, one of them will have to overlap the other—but how does one control which element comes out “on top”? This is where the property z-index comes in.
Now suppose that only the left and right margins are set to auto, not left, width, and right, as in this example:
What happens here is that the left and right margins, which are both auto, are set to be equal.