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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:07:59 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:07:59 +0100
commit6ef1fa4618e08426b874529619a66adbd3d1fcf0 (patch)
tree890e3e27131be010d82ef957fa68db495006cb0e /files/ja/conflicting/web/css/_colon_placeholder-shown
parent8260a606c143e6b55a467edf017a56bdcd6cba7e (diff)
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+---
+title: ':-moz-placeholder'
+slug: 'Web/CSS/:-moz-placeholder'
+tags:
+ - CSS
+ - CSS Reference
+ - Non-standard
+translation_of: 'Web/CSS/:placeholder-shown'
+translation_of_original: 'Web/CSS/:-moz-placeholder'
+---
+<p>{{Non-standard_header}}{{ CSSRef() }}{{ gecko_minversion_header("2.0") }}</p>
+
+<div class="note"><strong>Note:</strong> The <code>:-moz-placeholder</code> pseudo-class is deprecated in Firefox 19 in favor of the {{ cssxref('::-moz-placeholder') }} pseudo-element.</div>
+
+<div class="note"><strong>Note: </strong>The CSSWG have decided to introduce <code>:placeholder-shown</code>. This functionality will be reintroduced in Gecko at some point in the future, unprefixed and under the new name.  {{bug(1069012)}}</div>
+
+<h2 id="Summary" name="Summary">概要</h2>
+
+<p><code>:-moz-placeholder</code> は<a href="/en/HTML/HTML5/Forms_in_HTML5#The_placeholder_attribute" title="en/HTML/HTML5/Forms in HTML5#The placeholder attribute">プレースホルダ</a>を表示するフォーム要素にマッチします。この擬似クラスにより、Web 開発者やテーマデザイナーがプレースホルダの表示 (デフォルトは薄い灰色) をカスタマイズすることができます。</p>
+
+<p>たとえば、フォームフィールドの背景色をプレースホルダの色と似た色に変更した場合、プレースホルダが目立たなくなりうまく機能しません。しかし、この擬似クラスを利用してプレースホルダの文字色を変更すればいいのです。</p>
+
+<h2 id="Example" name="Example">例</h2>
+
+<p>この例はプレースホルダの文字色を緑色に変更しています。</p>
+
+<pre class="brush: html">&lt;!doctype html&gt;
+&lt;html&gt;
+&lt;head&gt;
+ &lt;title&gt;Placeholder demo&lt;/title&gt;
+ &lt;style type="text/css"&gt;
+ input:-moz-placeholder {
+ color: green;
+ }
+ &lt;/style&gt;
+&lt;/head&gt;
+&lt;body&gt;
+ &lt;input id="test" placeholder="Placeholder text!"&gt;
+&lt;/body&gt;
+&lt;/html&gt;
+</pre>
+
+<p><a href="/samples/cssref/moz-placeholder.html" title="https://developer.mozilla.org/samples/cssref/moz-placeholder.html">View this example live</a>.</p>
+
+<h2 id="Bugzilla" name="Bugzilla">Bugzilla</h2>
+
+<p>{{ Bug(457801) }}</p>
+
+<h2 id="Notes" name="Notes">注記</h2>
+
+<div class="note"><strong>Note:</strong> このページは Gecko 1.9 {{ geckoRelease("1.9") }} のリリース時に、<a class="link-https" href="https://bugzilla.mozilla.org/show_bug.cgi?id=11011" title="https://bugzilla.mozilla.org/show_bug.cgi?id=11011">全く異なる目的</a> から間違って作られていました。</div>
+
+<h3 id="SeeAlso" name="SeeAlso">参考</h3>
+
+<ul>
+ <li><a href="/en/HTML/HTML5/Forms_in_HTML5" title="en/HTML/HTML5/Forms in HTML5">Forms in HTML5</a></li>
+ <li>{{ HTMLElement("input") }}</li>
+ <li>{{ HTMLElement("textarea") }}</li>
+</ul>