This property allows a maximum width to be set for an element box. The calculation for the element's width may be less than this value, but if the calculated 'width' value is above this value it will recompute the 'width' using the 'max-width' value as the new 'width' value. If the value of 'min-width' is greater than the value of 'max-width', the 'max-width' property value becomes the 'min-width' value.

h5 { max-width: 150px }

Possible Values
inherit: Explicitly sets the value of this property to that of the parent.
none: No limit is placed on the maximum allowable width for the element.
[length]: Refers to an absolute measurement for the maximum computed element box width. Negative values are not allowed.
[percentage]: Refers to a percentage of the width of the containing element block.

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