diff options
author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
---|---|---|
committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/css/left | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
download | translated-content-33058f2b292b3a581333bdfb21b8f671898c5060.tar.gz translated-content-33058f2b292b3a581333bdfb21b8f671898c5060.tar.bz2 translated-content-33058f2b292b3a581333bdfb21b8f671898c5060.zip |
initial commit
Diffstat (limited to 'files/zh-cn/web/css/left')
-rw-r--r-- | files/zh-cn/web/css/left/index.html | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/files/zh-cn/web/css/left/index.html b/files/zh-cn/web/css/left/index.html new file mode 100644 index 0000000000..376c0b8168 --- /dev/null +++ b/files/zh-cn/web/css/left/index.html @@ -0,0 +1,210 @@ +--- +title: left +slug: Web/CSS/left +tags: + - CSS + - CSS Positioning + - CSS Property + - Reference +translation_of: Web/CSS/left +--- +<div>{{CSSRef}}</div> + +<p><a href="/zh-CN/docs/Web/CSS">CSS</a> <strong><code>left</code></strong>属性定义了定位元素的左外边距边界与其包含块左边界之间的偏移,非定位元素设置此属性无效。</p> + +<pre class="brush: css">/* <length> values */ +left: 3px; +left: 2.4em; + +/* <percentage>s of the width of the containing block */ +left: 10%; + +/* Keyword value */ +left: auto; + +/* Global values */ +left: inherit; +left: initial; +left: unset; +</pre> + +<p><code>left</code>的效果取决于元素的<code>position</code>属性:</p> + +<ul> + <li>当<code>position</code>设置为<code>absolute</code>或<code>fixed</code>时,<code>left</code>属性指定了定位元素左外边距边界与其包含块左边界之间的偏移。</li> + <li>当<code>position</code>设置为<code>relative</code>时,<code>left</code>属性指定了元素的左边界离开其正常位置的偏移。</li> + <li>当<code>position</code>设置为<code>sticky</code>时,如果元素在viewport里面,<code>left</code>属性的效果和position为<code>relative</code>等同;如果元素在viewport外面,<code>left</code>属性的效果和position为<code>fixed</code>等同。</li> + <li>当<code>position</code>设置为<code>static</code>时,<code>left</code>属性无效。</li> +</ul> + +<p>当<font face="consolas, Liberation Mono, courier, monospace"><code>left</code>和</font>{{cssxref("right")}}同时指定时,元素的位置会被重复指定。当容器是从左到右时,<code>left</code>的值会被优先设定;当容器是从右到左时,<code>right</code>的值会被优先设定。</p> + +<p>{{cssinfo}}</p> + +<h2 id="语法">语法</h2> + +<h3 id="值">值</h3> + +<dl> + <dt>{{cssxref("<length>")}}</dt> + <dd>可以是负的,正的 或者 null {{cssxref("<length>")}} 表示: + <ul> + <li>对于绝对定位的元素,元素左外边距边界与其包含块左边界之间的偏移。</li> + <li>对于相对定位定位的元素,元素的左边界离开其正常位置的偏移。</li> + </ul> + </dd> + <dt>{{cssxref("<percentage>")}}</dt> + <dd>代表元素包含块的宽度的百分比 {{cssxref("<percentage>")}}。</dd> + <dt><code>auto</code></dt> + <dd>这个关键字表示: + <ul> + <li>对于绝对定位元素,元素将忽略此属性而以{{ Cssxref("right") }}属性为准,如果此时设置<code>width: auto</code>,将基于内容需要的宽度设置宽度;如果<code>right</code>也为<code>auto</code>的话,元素的水平位置就是它假如作为静态(即static)元素时该在的位置。</li> + <li>对于相对定位元素,元素相对正常位置的偏移量将基于{{ Cssxref("right") }}属性;如果<code>right</code>也为<code>auto</code>的话,元素将不会有偏移。</li> + </ul> + </dd> + <dt><code>inherit</code></dt> + <dd>这个关键字表示该值与其父元素 (可能不是它的包含块) 的计算值相同。对这个计算值的处理将和它原本为 {{cssxref("<length>")}}, {{cssxref("<percentage>")}} 或 <code>auto</code> 一样。</dd> +</dl> + +<h3 id="常用语法">常用语法</h3> + +<pre class="syntaxbox">{{csssyntax}}</pre> + +<h2 id="示例">示例</h2> + +<h3 id="CSS">CSS</h3> + +<pre class="brush: css">#wrap { + width: 700px; + margin: 0 auto; + background: #5C5C5C; +} + +pre { + white-space: pre; + white-space: pre-wrap; + white-space: pre-line; + word-wrap: break-word; +} + +#example_1 { + width: 200px; + height: 200px; + position: absolute; + left: 20px; + top: 20px; + background-color: #D8F5FF; +} + +#example_2 { + width: 200px; + height: 200px; + position: relative; + top: 0; + right: 0; + background-color: #C1FFDB; + +} +#example_3 { + width: 600px; + height: 400px; + position: relative; + top: 20px; + left: 20px; + background-color: #FFD7C2; +} + +#example_4 { + width:200px; + height:200px; + position:absolute; + bottom:10px; + right:20px; + background-color:#FFC7E4; +}</pre> + +<h3 id="HTML">HTML</h3> + +<pre class="brush: html"><div id="wrap"> + <div id="example_1"> + <pre> + position: absolute; + left: 20px; + top: 20px; + </pre> + <p>The only containing element for this div is the main window, so it positions itself in relation to it.</p> + </div> + + <div id="example_2"> + <pre> + position: relative; + top: 0; + right: 0; + </pre> + <p>Relative position in relation to its siblings.</p> + </div> + + <div id="example_3"> + <pre> + float: right; + position: relative; + top: 20px; + left: 20px; + </pre> + <p>Relative to its sibling div above, but removed from flow of content.</p> + + <div id="example_4"> + <pre> + position: absolute; + bottom: 10px; + right: 20px; + </pre> + <p>Absolute position inside of a parent with relative position</p> + </div> + </div> +</div></pre> + +<h3 id="案例">案例</h3> + +<p>{{EmbedLiveSample('示例',1200,650)}}</p> + +<h2 id="规范">规范</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName('CSS3 Transitions', '#animatable-css', 'left')}}</td> + <td>{{Spec2('CSS3 Transitions')}}</td> + <td>Defines <code>left</code> as animatable.</td> + </tr> + <tr> + <td>{{SpecName('CSS3 Positioning', '#propdef-left', 'left')}}</td> + <td>{{Spec2('CSS3 Positioning')}}</td> + <td>Adds behavior for sticky positioning.</td> + </tr> + <tr> + <td>{{SpecName('CSS2.1', 'visuren.html#propdef-left', 'left')}}</td> + <td>{{Spec2('CSS2.1')}}</td> + <td>Initial definition.</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器兼容">浏览器兼容</h2> + +<div class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div> + +<p>{{Compat("css.properties.left")}}</p> + +<h2 id="参见">参见</h2> + +<ul> + <li>{{cssxref("position")}}, {{cssxref("right")}}, {{cssxref("top")}}, {{cssxref("bottom")}}</li> +</ul> |