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CSS

Smooth Open and Close Animation for Details Blocks

Animates Details (accordion) blocks so the answer slides open and closed smoothly instead of jumping, in browsers that support animating to auto height.

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Code

@media (prefers-reduced-motion: no-preference) {
    :root {
        interpolate-size: allow-keywords;
    }

    details::details-content {
        height: 0;
        overflow: clip;
        transition: height 0.3s ease, content-visibility 0.3s allow-discrete;
    }

    details[open]::details-content {
        height: auto;
    }
}

Notes

Supported in recent Chrome and Edge; other browsers open instantly as before. Off for visitors who prefer reduced motion.

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