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CSS 參考

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CSS 屬性

align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-shadow box-sizing caption-side clear clip color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-size font-size-adjust font-stretch font-style font-variant font-weight hanging-punctuation height justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width @media min-height min-width nav-down nav-index nav-left nav-right nav-up opacity order outline outline-color outline-offset outline-style outline-width overflow overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin position quotes resize right tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi vertical-align visibility white-space width word-break word-spacing word-wrap z-index

CSS :focus Selector

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例

選擇當它獲得焦點樣式輸入字段：

input:focus {
background-color: yellow;
}

更多"Try it Yourself"下面的例子。

定義和用法

在：注重選擇用於選擇具有焦點的元素。

Tip:本：重點選擇是允許在接受鍵盤事件或其他用戶輸入的元素。

版：	CSS2

瀏覽器支持

在表中的數字指定完全支持選擇第一瀏覽器的版本。

選擇
:focus	4	8	2.0	3.1	9.6

Note:適用於：重點在IE8的工作，一個<！DOCTYPE>必須申報。

CSS語法

:focus {
css declarations ;
} Demo

更多示例

例

當<input type="text">獲得焦點，逐漸從寬度為100像素改變250像素：

input[type=text] {
    width: 100px;
    transition: ease-in-out, width .35s ease-in-out;
}

input[type=text]:focus {
    width: 250px;
}

相關頁面

CSS教程： CSS偽類

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