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CSS is the language we use to style an HTML document.

CSS describes how HTML elements should be displayed.

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body {
background-color: lightblue;
}

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W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

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Flexbox browser support

Three versions of the flexbox spec - each with different syntax - have been implemented in browsers.

The two 2012 specs are roughly equivilant in terms of features, differing mainly in syntax. The earlier 2009 spec is less comprehensive though covers a lot of the same ground.

More browser support info available on caniuse.com.

Known issues

Flexbox early 2012

Flexbox early 2012 (Internet Explorer 10)

Flexbox 2009

Box wrapping is not supported. box-lines is the property in this spec to achieve wrapping, though unfortunately no browser implemented it.

Ordering flex-items with box-ordinal-group requires a positive integer (the value 0 is also valid in Firefox but not in Webkit, so just use positive integers).

Flexbox 2009 (Firefox)

Firefox has a number of non-trivial issues with its 2009 implementation:

The setting display: box is treated as display: inline-box if there is no width set.

Percentage widths set on flex items are ignored.

The setting box-align: justify (equiv. justify-content: space-between) does not work.

Flexbox ignores overflow: hidden and expands the flexbox child when the content is larger than the child's width.

The outline on flexbox children is padded as if by a transparent border of the same width.

If you set box-flex to 0, Firefox forces the element to act like it's using the quirks-mode box model.

Further reading

Code and design by @pete_b. Prefixing and polyfills generated by CSS-Crush

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Flexy Boxes - CSS flexbox playground and code generation tool

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Online CSS flexbox playground and code generator. Supports all existing flexbox implementations.

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Laws of UX es una colección de mejores prácticas que los diseñadores pueden considerar al crear interfaces de usuario.