Is the image width and height stored in Facebook's gallery database?
In typical JavaScript usage, the image width and height cannot be determined until the image is fully loaded. However, on Facebook, images are pre-loaded before being displayed, ensuring that they are properly centered both horizontally and vertically.
When displaying images on Facebook, they use display:inline-block for the image and text-align:center for the parent div in order to center the image in theater mode.
For a detailed explanation of how they achieved this, you can read their blog post. It's an interesting CSS code implementation that involves using JavaScript to dynamically adjust the line-height of one of the divs based on the window.height.
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