この翻訳は不完全です。英語から この記事を翻訳 してください。
background-position-x CSS プロパティは、定義された各背景画像に対して、background-origin によって定義された背景位置レイヤーに対する初期水平位置を設定します。
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The value of this property is overridden by any declaration of the background or background-position shorthand properties applied to the element after it.
Syntax
/* Keyword values */ background-position-x: left; background-position-x: center; background-position-x: right; /* <percentage> values */ background-position-x: 25%; /* <length> values */ background-position-x: 0px; background-position-x: 1cm; background-position-x: 8em; /* Side-relative values */ background-position-x: right 3px; background-position-x: left 25%; /* Multiple values */ background-position-x: 0px, center; /* Global values */ background-position-x: inherit; background-position-x: initial; background-position-x: unset;
The background-position-x property is specified as one or more values, separated by commas.
Values
left- Aligns the left edge of the background image with the left edge of the background position layer.
center- Aligns the center of the background image with the center of the background position layer.
right- Aligns the right edge of the background image with the right edge of the background position layer.
<length>- The offset of the given background image's horizontal edge from the corresponding background position layer's horizontal edge. If no edge is given, it refers to the left edge.
<percentage>- The offset of the given background image's horizontal edge from the corresponding background position layer's horizontal edge relative to its width. If no edge is given, it refers to the left edge by default.
Formal syntax
[ center | [ left | right | x-start | x-end ]? <length-percentage>? ]#where
<length-percentage> = <length> | <percentage>
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Backgrounds and Borders Module Level 4 background-position-x の定義 |
編集者草案 | Initial specification of longhand sub-properties of background-position to match longstanding implementations. |
| 初期値 | left |
|---|---|
| 適用対象 | 全要素 |
| 継承 | 不可 |
| パーセンテージ | refer to width of background positioning area minus height of background image |
| メディア | visual |
| 計算値 | A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword |
| アニメーションの種類 | 個別 |
| 正規順序 | 形式文法で定義される一意のあいまいでない順序 |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| 機能 | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| 基本対応 | あり | 12 | 49 | 6 | あり | あり |
| Two-value syntax (support for offsets from any edge) | なし | 12 | 49 | 9 | なし | なし |
| 機能 | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| 基本対応 | あり | あり | あり | 49 | ? | ? | あり |
| Two-value syntax (support for offsets from any edge) | なし | なし | あり | 49 | なし | なし | なし |