min-height

Sumário

A propriedade min-height do CSS é usado para definir a altura mínima de um determinado elemento. Ele impede que o valor usado da propriedade height se torne menor que o valor especificado para min-height.
O valor de min-height substitui os dois max-height e height.

Initial value	`0`
Aplica-se a	all elements but non-replaced inline elements, table columns, and column groups
Inherited	não
Percentages	The percentage is calculated with respect to the height of the generated box's containing block. If the height of the containing block is not specified explicitly (i.e., it depends on content height), and this element is not absolutely positioned, the percentage value is treated as `0`.
Midia	visual
Computed value	the percentage as specified or the absolute length
Animation type	a length, percentage or calc();
Canonical order	the unique non-ambiguous order defined by the formal grammar

Sintaxe

sintaxe forma: <length> | <percentage> | auto | max-content | min-content | fit-content | fill-available

min-height: 3.5em
min-height: 10%
min-height: max-content
min-height: min-content
min-height: fit-content
min-height: fill-available

min-height: inherit

Valores

<length>: O valor fixo mínimo da altura. Veja <length> para possíveis unidades. Valores negativos fazem da declaração inválida.
<percentage>: O valor fixo mínimo da altura expressado como uma <percentage> do conteúdo da altura do bloco. Valores negativos fazem da declaração inválida.
max-content: The intrinsic preferred height.
min-content: The intrinsic minimum height.
fill-available: The containing block height minus horizontal margin, border and padding. Some browsers implement an ancient name for this keyword, available.
fit-content: According CSS3 Box, this is a synonym of min-content. CSS3 Sizing defines a more complex algorithm, but no browser implements it, even in an experimental way.

Exemplos

table { min-height: 75%; }

form { min-height: 0; }

Especificações

Especificação	Status	Comentário
CSS Intrinsic & Extrinsic Sizing Module Level 3 The definition of 'min-height' in that specification.	Working Draft	Adds the `max-content`, `min-content`, `fit-content`, and `fill-available` keywords. Both CSS3 Box and CSS3 Writing Modes drafts defined at some point these keywords. These drafts are superseded by this spec.
CSS Flexible Box Layout Module The definition of 'min-height' in that specification.	Candidate Recommendation	An earlier revision of the spec added the `auto` keyword and used it as the initial value. The CSSWG subsequently resolved to revert this change, however. As of March 29, 2013, the latest Editor's Draft doesn't modify the `min-width` property anymore (i.e. it no longer introduces the `auto` value).
CSS Transitions The definition of 'min-height' in that specification.	Working Draft	Defines `min-height` as animatable.
CSS Level 2 (Revision 1) The definition of 'min-height' in that specification.	Recommendation	Initial definition.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	1.0	3.0 (1.9)	7.0	4.0	1.0 2.0.2 (416) for positioned elements
applies to `<table>` [1]	Não suportado	(Yes)	Não suportado	(Yes)	Não suportado
`max-content`, `min-content`, `fit-content`, and `fill-available`	Não suportado	Não suportado	Não suportado	Não suportado	Não suportado
`auto`Obsolete since Gecko 22	21.0	16.0 (16.0)	Não suportado	12.10	Não suportado
`auto` as initial valueObsolete since Gecko 22	21.0	18.0 (18.0)	Não suportado	12.10	Não suportado

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	?	?	?	?

Notas

[1] CSS 2.1 explicitly leaves the behavior of min-height with <table> undefined. Therefore any behavior is CSS2.1-compliant; newer CSS specifications may define this behavior, so Web developers shouldn't rely on a specific one now.

[2] Due to bug (bug 307866) Firefox doesn't hande min-height on elements with display: table-*.

Ver também

width, height, max-height
The box model, min-width, box-sizing, height, max-height