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Creating a Box of a 16:9 Aspect-Ratioġ6:9 aspect ratio means height is 9/16 times the width, which comes as 0.5625 or 56.25%. In the above case the top padding of #child will be adjusted as 200px (50% of 400px).Īll padding properties padding-top, padding-bottom, padding-left & padding-right follow this - they use the parent's width.
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When setting padding as a length (20px, 1.5em etc), it is fixed to the given value.īut when setting padding as a percentage, it is calculated on the width of the parent element.įor example consider the below markup and their CSS : Here comes the solution : Using padding as a percentage! CSS Padding Property as a Percentage A child can be created whose height: 100%, width: 100% is set and our work could be done.īut how can we create a box whose height is in propotion to its width ? If we need to show a video of 16:9 aspect ratio, we could create a parent with aspect ratio of 16:9. The solution to the problem sounds simple. Creating a Box of a Specified Aspect-Ratio This tutorial describes such a solution based purely on CSS. An elegant solution - something based on percentages would be great. Yes you can use queries to set height and width for different screen sizes, but that is mostly a pain with calculations involved and no guarantees for all screen sizes. The problem comes up in maintaining responsiveness. When you know the screen size, then you can set height and width for the video. And width and height should obviously be such that the aspect ratio of the video is preserved. The browser needs both width and height properties to render the video properly. Unfortunately this does not work for the HTML5 element. When the height is specified, then width is automatically set.
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That is if the width is specified, then height will be automatically set maintaining the aspect ratio of the image. When browsers render an, they maintain the aspect ratio for the image.