background-color

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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    Portions of this content are ©1998– 2023 by individual mozilla.org contributors. Content available under a Creative Commons license.

    Источник

    background-color

    CSS-свойство background-color CSS устанавливает цвет фона элемента.

    Интерактивный пример

    Синтаксис

    /* Словесные значения */ background-color: red; /* Шестнадцатеричное значение */ background-color: #bbff00; /* Шестнадцатеричное значение с alpha-каналом */ background-color: #11ffee00; /* 00 - полностью прозрачный */ background-color: #11ffeeff; /* ff - непрозрачный */ /* RGB-значение */ background-color: rgb(255, 255, 128); /* RGBA-значение или RGB с alpha-каналом */ background-color: rgba(117, 190, 218, 0.0); /* 0.0 - полностью прозрачный */ background-color: rgba(117, 190, 218, 0.5); /* 0.5 - полупрозрачный */ background-color: rgba(117, 190, 218, 1.0); /* 1.0 - непрозрачный */ /* HSLA-значение */ background-color: hsla(50, 33%, 25%, 0.75); /* Специальные словесные значения */ background-color: currentColor; background-color: transparent; /* Общие значения */ background-color: inherit; background-color: initial; background-color: unset; 

    Свойство background-color определяется единственным значением .

    Значения

    Формальный синтаксис

    Примеры

    HTML

    div class="exampleone"> Lorem ipsum dolor sit amet, consectetuer div> div class="exampletwo"> Lorem ipsum dolor sit amet, consectetuer div> div class="examplethree"> Lorem ipsum dolor sit amet, consectetuer div> 

    CSS

    .exampleone  background-color: teal; color: white; > .exampletwo  background-color: rgb(153, 102, 153); color: rgb(255, 255, 204); > .examplethree  background-color: #777799; color: #FFFFFF; > 

    Результат

    Проблемы доступности

    Важно обеспечить достаточный цветовой контраст между цветом текста и фоном, чтобы люди со слабым зрением могли его прочитать, но при этом должна быть достаточная разница между введённым текстом и текстом placeholder, чтобы пользователь не путал их.

    Коэффициент цветового контраста определяется путём сравнения яркости текста placeholder и цветом фона формы ввода. Чтобы соответствовать рекомендациям Web Content Accessibility Guidelines (WCAG), требуется соотношение 4.5:1 для основного текста и 3:1 для более крупного текста, например, заголовков. Крупный текст определяется как 18.66px и больше с жирным начертанием или 24px и больше с обычным начертанием.

    Спецификации

    Совместимость с браузерами

    BCD tables only load in the browser

    Смотрите также

    Found a content problem with this page?

    This page was last modified on 10 окт. 2022 г. by MDN contributors.

    Your blueprint for a better internet.

    Источник

    CSS Backgrounds

    The CSS background properties are used to add background effects for elements.

    In these chapters, you will learn about the following CSS background properties:

    • background-color
    • background-image
    • background-repeat
    • background-attachment
    • background-position
    • background (shorthand property)

    CSS background-color

    The background-color property specifies the background color of an element.

    Example

    The background color of a page is set like this:

    With CSS, a color is most often specified by:

    • a valid color name — like «red»
    • a HEX value — like «#ff0000»
    • an RGB value — like «rgb(255,0,0)»

    Look at CSS Color Values for a complete list of possible color values.

    Other Elements

    You can set the background color for any HTML elements:

    Example

    Here, the ,

    , and elements will have different background colors:

    div background-color: lightblue;
    >

    Opacity / Transparency

    The opacity property specifies the opacity/transparency of an element. It can take a value from 0.0 — 1.0. The lower value, the more transparent:

    Example

    Note: When using the opacity property to add transparency to the background of an element, all of its child elements inherit the same transparency. This can make the text inside a fully transparent element hard to read.

    Transparency using RGBA

    If you do not want to apply opacity to child elements, like in our example above, use RGBA color values. The following example sets the opacity for the background color and not the text:

    You learned from our CSS Colors Chapter, that you can use RGB as a color value. In addition to RGB, you can use an RGB color value with an alpha channel (RGBA) — which specifies the opacity for a color.

    An RGBA color value is specified with: rgba(red, green, blue, alpha). The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (fully opaque).

    Tip: You will learn more about RGBA Colors in our CSS Colors Chapter.

    Example

    The CSS Background Color Property

    Источник

    CSS background-color Property

    The background-color property sets the background color of an element.

    The background of an element is the total size of the element, including padding and border (but not the margin).

    Tip: Use a background color and a text color that makes the text easy to read.

    Default value:	transparent
    Inherited:	no
    Animatable:	yes. Read about animatable Try it
    Version:	CSS1
    JavaScript syntax:	object.style.backgroundColor=»#00FF00″ Try it

    Browser Support

    The numbers in the table specify the first browser version that fully supports the property.

    CSS Syntax

    Property Values

    Value	Description	Demo
    color	Specifies the background color. Look at CSS Color Values for a complete list of possible color values.	Demo ❯
    transparent	Specifies that the background color should be transparent. This is default	Demo ❯
    initial	Sets this property to its default value. Read about initial
    inherit	Inherits this property from its parent element. Read about inherit

    More Examples

    Example

    Specify the background color with a HEX value:

    Example

    Specify the background color with an RGB value:

    Example

    Specify the background color with an RGBA value:

    Example

    Specify the background color with a HSL value:

    Example

    Specify the background color with a HSLA value:

    Example

    Set background colors for different elements:

    body <
    background-color: #fefbd8;
    >

    h1 background-color: #80ced6;
    >

    div background-color: #d5f4e6;
    >

    span background-color: #f18973;
    >

    Источник

    background-color

    Определяет цвет фона элемента. Хотя это свойство не наследует свойства своего родителя, из-за того, что начальное значение устанавливается прозрачным, цвет фона дочерних элементов совпадает с цветом фона родительского элемента.

    Синтаксис

    background-color: | transparent | inherit

    Значения

    transparent Устанавливает прозрачный фон. inherit Наследует значение родителя.

    HTML5 CSS2.1 IE Cr Op Sa Fx

           
    Lorem ipsum dolor sit amet
     
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diem nonummy nibh euismod tincidunt ut lacreet dolore magna aliguam erat volutpat.
      

    В данном примере для элементов веб-страницы применяется три различных способа задания фонового цвета. Результат примера показан на рис. 1.

    

    Рис. 1. Применение background-color

    Объектная модель

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

    Браузеры

    Internet Explorer до версии 7.0 включительно не поддерживает значение inherit .

    Источник

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