background-position

Задает начальное положение фонового изображения, установленного с помощью свойства background-image . В CSS3 допустимо указывать несколько значений для каждого фона, перечисляя значения через запятую.

Синтаксис

background-position: [left | center | right | | ] || [top | center | bottom | | ] | inherit

= [left | center | right | | ] || [top | center | bottom | | ] | inherit.

Значения

У свойства background-position два значения, положение по горизонтали (может быть — left , center , right ) и вертикали (может быть — top , center , bottom ). Кроме использования ключевых слов положение также можно задавать в процентах, пикселах или других единицах. Если применяются ключевые слова, то порядок их следования не имеет значения, при процентной записи вначале задается положение рисунка по горизонтали, а затем, через пробел, положение по вертикали. Отношение между используемыми ключевыми словами и процентной записью следующее.

top left = left top = 0% 0% (в левом верхнем углу)
top = top center = center top = 50% 0% (по центру вверху)
right top = top right = 100% 0% (в правом верхнем углу)
left = left center = center left = 0% 50% (по левому краю и по центру)
center = center center = 50% 50% (по центру)
right = right center = center right = 100% 50% (по правому краю и по центру)
bottom left = left bottom = 0% 100% (в левом нижнем углу)
bottom = bottom center = center bottom = 50% 100% (по центру внизу)
bottom right = right bottom = 100% 100% (в правом нижнем углу)

В скобках указано, где располагается фоновый рисунок относительно контейнера.

При inherit значение наследуется у родителя элемента.

XHTML 1.0 CSS2.1 IE Cr Op Sa Fx

HTML5 CSS3 IE Cr Op Sa Fx

Объектная модель

[window.]document.getElementById(» elementID «).style.backgroundPosition

Браузеры

Internet Explorer до версии 7.0 включительно не поддерживает значение inherit .

CSS по теме

Источник

background

The background shorthand CSS property sets all background style properties at once, such as color, image, origin and size, or repeat method. Component properties not set in the background shorthand property value declaration are set to their default values.

Try it

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

/* Using a */ background: green; /* Using a and */ background: url("test.jpg") repeat-y; /* Using a and */ background: border-box red; /* A single image, centered and scaled */ background: no-repeat center/80% url("../img/image.png"); /* Global values */ background: inherit; background: initial; background: revert; background: revert-layer; background: unset;

The background property is specified as one or more background layers, separated by commas.

The syntax of each layer is as follows:

Each layer may include zero or one occurrences of any of the following values:
- The value may only be included immediately after , separated with the ‘/’ character, like this: » center/80% «.
- The value may be included zero, one, or two times. If included once, it sets both background-origin and background-clip . If it is included twice, the first occurrence sets background-origin , and the second sets background-clip .
- The value may only be included in the last layer specified.
Values

See background-clip and background-origin . Default: border-box and padding-box respectively.

See background-color . Default: transparent .

The following three lines of CSS are equivalent:
```
background: none; background: transparent; background: repeat scroll 0% 0% / auto padding-box border-box none transparent; 
```
Accessibility concerns

Browsers do not provide any special information on background images to assistive technology. This is important primarily for screen readers, as a screen reader will not announce its presence and therefore convey nothing to its users. If the image contains information critical to understanding the page’s overall purpose, it is better to describe it semantically in the document.

Formal definition
- background-image : none
- background-position : 0% 0%
- background-size : auto auto
- background-repeat : repeat
- background-origin : padding-box
- background-clip : border-box
- background-attachment : scroll
- background-color : transparent
- background-position : refer to the size of the background positioning area minus size of background image; size refers to the width for horizontal offsets and to the height for vertical offsets
- background-size : relative to the background positioning area
- background-image : as specified, but with url() values made absolute
- background-position : as each of the properties of the shorthand:
  - background-position-x : A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
  - background-position-y : A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
  - background-color : a color
  - background-image : discrete
  - background-clip : a repeatable list of
  - background-position : a repeatable list of
  - background-size : a repeatable list of
  - background-repeat : discrete
  - background-attachment : discrete
  Formal syntax
  
  background =
  [ # , ]?
  
  =
  ||
  [ / ]? ||
  ||
  ||
  ||
  
  =
  ||
  ||
  [ / ]? ||
  ||
  ||
  ||
  
  =
  |
  none
  
  =
  [ left | center | right | top | bottom | ] |
  [ left | center | right | ] [ top | center | bottom | ] |
  [ center | [ left | right ] ? ] && [ center | [ top | bottom ] ? ]
  
  =
  [ | auto ] |
  cover |
  contain
  
  =
  repeat-x |
  repeat-y |
  [ repeat | space | round | no-repeat ]
  
  =
  scroll |
  fixed |
  local
  
  =
  border-box |
  padding-box |
  content-box
  
  =
  |
  
  =
  |
  
  =
  url( * ) |
  src( * )
  
  Examples
  
  Setting backgrounds with color keywords and images
  
  HTML
```
p class="topbanner"> Starry skybr /> Twinkle twinklebr /> Starry sky p> p class="warning">Here is a paragraphp> p>p> 
```
  CSS
```
.warning  background: pink; > .topbanner  background: url("starsolid.gif") #99f repeat-y fixed; > 
```
  Result
  
  Specifications
  
  Browser compatibility
  
  BCD tables only load in the browser
  
  See also
  
  Found a content problem with this page?
  
  This page was last modified on Jul 18, 2023 by MDN contributors.
  
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  Источник

background-position