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CSS Pocket Reference, 4th Edition by Eric A. Meyer

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Name

max-width

Values:

<length> | <percentage> | none

Initial value:

none

Applies to:

All elements except inline nonreplaced elements and table elements

Inherited:

No

Percentages:

Refer to the height of the containing block

Computed value:

For percentages, as declared; for length values, the absolute length; otherwise, none

Description:

Defines a maximum constraint on the width of the element (the exact nature of that width is dependent on the value of box-sizing). Thus, the element can be narrower than the declared value but not wider. Negative values are not permitted.

Example:

#sidebar img {width: 50px; max-width: 100%;}

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