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    border-top-left-radius

    概要

    border-top-left-radius CSS プロパティは、要素の左上隅の丸め処理を設定します。丸めは、円または楕円とする事が可能です。 値を 0 とした場合の丸めは行われず、コーナーは正方形となります。

    border-radius.png

    A background, being an image or a color, is clipped at the border, even a rounded one; the exact location of the clipping is defined by the value of the background-clip property.

    背景、画像、色は、境界で丸くクリッピングされます。クリッピングの正確な場所は、background-clip プロパティの値によって定義されます。

    If the value of this property is not set in a border-radius shorthand property that is applied to the element after the border-top-left-radius CSS property, the value of this property is then reset to its initial value by the shorthand property.
    • 初期値 0
    • 適用対象 全要素
    • 継承 継承しない
    • <割合> 可。ボーダーボックスのサイズを基準とする。
    • メディア visual
    • 計算値 the dimension of the semi-major and semi-minor axis, that is two absolute <length> values
    • アニメーションの可否

    構文

    Formal grammar: [ <length> | <percentage> ] [ <length> | <percentage> ]? 
    border-top-left-radius: radius               /* the corner is a circle    */  E.g. border-top-left-radius: 3px
    border-top-left-radius: horizontal vertical  /* the corner is an ellipsis */  E.g. border-top-left-radius: 0.5em 1em
    
    border-top-left-radius: inherit
    

    where:

    radius
    Is a <length> or a <割合> denoting the radius of the circle to use for the border in that corner.
    horizontal
    Is a <length> or a <割合> denoting the horizontal semi-major axis of the ellipsis to use for the border in that corner.
    vertical
    Is a <length> or a <割合> denoting the vertical semi-major axis of the ellipsis to use for the border in that corner.

    <length>
    Denotes the size of the circle radius or the semi-major and semi-minor axes of the ellipsis. It can be expressed in any unit allowed by the CSS <length> data types. Negative values are invalid.
    <percentage>
    Denotes the size of the circle radius, or the semi-major and semi-minor axes of the ellipsis, using percentage values. Percentages for the horizontal axe refer to the width of the box, percentages for the vertical axe refer to the height of the box. Negative values are invalid.

    Live example Code
     
    An arc of circle is used as the border
    div {
      border-top-left-radius: 40px 40px;
    }
     
    An arc of ellipse is used as the border
    div {
      border-top-left-radius: 40px 20px;
    }
    
     
    The box is a square: an arc of circle is used as the border
    div 
      border-top-left-radius: 40%;
    }
    
     
    The box is not a square: an arc of ellipse is used as the border
    div {
      border-top-left-radius: 40%;
    }
    
     
    The background color is clipped at the border
    div {
      border-top-left-radius:40%;
      border-style: black 3px double;
      background-color: rgb(250,20,70);
      background-clip: content-box;
    }
    

    仕様

    仕様書 策定状況 コメント
    CSS Backgrounds and Borders Module Level 3 勧告候補 Initial specification

    ブラウザ実装状況

    機能 Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    基本サポート 0.2 -webkit

    1.0 (1.0) - 12.0 (12.0)-moz
    但し後に仕様で定義された正式名称と異なる :
    -moz-border-radius-topleft

    9.0 10.5 3.0 (522) -webkit
    4.0 4.0 (2.0) 5.0 (532.5)
    相対値の指定 4.0 1.0 (1.0) with a bug (see note) 9.0 10.5 5.0 (532.5)
    4.0 (2.0)
    Elliptical corners 0.2 3.5 (1.9.1) 9.0 10.5 3.0 (522 )
    機能 Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
    基本サポート ? ? ? ? ?

    ブラウザに関する注記

    Gecko

    • The prefixed version (allowed from Firefox 1 to Firefox 12) of this property uses a different name, -moz-border-radius-topleft, than the final property as Mozilla implemented it before the final name was coined.
    • Before Firefox 4, the <割合> was relative to the width of the box even when specifying the radius for a height). This implied that -moz-border-radius-topleft was always drawing an arc of circle, and never an ellipse, when followed by a single value.
    • Gecko is not able to display dotted and dashed rounded corners correctly: it displays them as solid (バグ 382721).

    関連情報

    The border-radius-related CSS properties: the CSS shorthand border-radius, the properties for the other corners: border-top-right-radius, border-bottom-right-radius, and border-bottom-left-radius.

    ドキュメントのタグと貢献者

    Contributors to this page: FredB, ethertank, Yuichiro
    最終更新者: ethertank,
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