Created
August 27, 2014 15:09
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| .vertically_align { | |
| width: 256px; | |
| height: 256px; | |
| overflow: hidden; | |
| } | |
| .vertically_align:before { | |
| content: ""; | |
| vertical-align: middle; | |
| display: inline-block; | |
| height: 100%; | |
| } | |
| .vertically_align img { | |
| vertical-align: middle; | |
| display: inline-block; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>This will work</h1> | |
| <div class="vertically_align"><img src="http://read.pudn.com/downloads73/sourcecode/windows/11773/lena(256)__.jpg"/></div> | |
| <h1>This will not work (due to there being whitespace?)</h1> | |
| <div class="vertically_align"> | |
| <img src="http://read.pudn.com/downloads73/sourcecode/windows/11773/lena(256)__.jpg"/> | |
| </div> | |
| </body> | |
| </html> |
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Basically the browser is inserting spaces before and/or after the image because it's treating the content inside vertically align as inline (basically like text). This makes the browser think the content content is wider than 256px and drops it onto the next line, as it would with text.
You can see this by changing .vertically_align width to 260px and seeing it work. No idea why :after fixes it, but it does.