Why Doesn't Flexbox Work as Expected with `` Elements?

Why

Resists Flexbox

When applying flex display to a

element, unexpected behavior occurs in browsers such as Firefox and Chrome. Flex behaves like block, and inline-flex like inline-block, despite specifications not indicating any special handling for

.

The Reason

According to Bug 984869,

, along with and , are not fully implementable in pure CSS and therefore act as black boxes. This means they may not respond identically to other CSS-styled elements.

Specifically, for

, browsers render it with a predetermined frame class, which governs the layout of its child elements. This frame class overrides the display property set in CSS.

Best Practices

To achieve the desired layout within a

cross-browser, it's advisable to use a wrapper

inside the

, similar to how you would within a

.

Update for Firefox

Firefox versions 46 and later implement Flexbox for

, resolving Bug 1230207.

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