How to Achieve a Consistent \'Background-Size: Cover\' Effect for and with Pure CSS?

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Cover Background Simulation for

Achieving a consistent "background-size: cover" effect for elements like

CSS Solution without Edge Cases:

Instead of relying on scripts, a CSS solution with no edge cases can be implemented using the following steps:

1. Set the parent element to have overflow: hidden.
2. Set the video or image element to height: 100%;.
3. Calculate the width based on the aspect ratio (e.g., 100 * 16 / 9 for 16:9 videos).
4. Set min-width: 100%; to prevent resizing smaller than the parent.
5. Set min-height to ensure the height scales down proportionally.

Example:

<code class="css">.parent-element-to-video {
    overflow: hidden;
}

video {
    height: 100%;
    width: 177.77777778vh; /* 100 * 16 / 9 */
    min-width: 100%;
    min-height: 56.25vw; /* 100 * 9 / 16 */
}</code>

Centered Video:

To center the video, use the following CSS:

<code class="css">.parent-element-to-video {
    position: relative;
}

video {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}</code>

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