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Why should a developer avoid `overflow:hidden` on a container element?

A developer must not use `overflow:hidden` on a container element. This CSS property can stop animations from working. It can also hide parts of elements that use `position:absolute`.

By Pawan Nayar · from the LLOS AI Learning record

The rule

A developer must not use `overflow:hidden` on a container element.

This CSS property can stop animations from working. It can also hide parts of elements that use `position:absolute`.

The `overflow:hidden` property tells a web browser to hide content that goes outside an element's box. This can cause problems for animations. Parts of an animation might disappear. Elements positioned with `position:absolute` can also be cut off. A developer should use `overflow:hidden` only when it is truly needed.

A developer creates a website with a special animation. The animation makes an image slide out of a box. The developer adds `overflow:hidden` to the box's container. When the animation plays, the image disappears as soon as it leaves the box. The user cannot see the full animation.

Words you'll need

Resolved from this lesson's own record — real definitions, not invented for this page.

Performance Optimization

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Questions people ask

More from the same record, pulled by shared topic — not written new for this page.

Why should a developer use one HTML file with CSS breakpoints instead of two separate files for desktop and mobile versions?

The difference between desktop and mobile views should be handled by CSS, not by having separate files. Desktop rules go inside `@media (min-width:901px)`.

How can a developer make sure a user sees the top of new content in a reusable panel or modal?

A developer should reset the scroll position of a reusable panel or modal. This action must happen before the panel or modal displays new content.

How can a developer position a child element relative to its parent using CSS?

A developer can set the parent element's CSS `position` to `relative`. This allows child elements with `position: absolute` to move within the parent.

How should a developer update JavaScript when a pane's CSS position changes from 'fixed' to 'absolute'?

A developer must update the JavaScript code that sets the pane's 'top' style. When a pane switches from 'position:fixed' to 'position:absolute', the 'top' value should be reset.

What to remember

A developer must not use `overflow:hidden` on a container element. This CSS property can stop animations from working. It can also hide parts of elements that use `position:absolute`.