W3Schools Tryit Editor

<!doctype html>
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<body>
<h1>The mask Property</h1>
<h3>An image with a mask layer (from top to bottom):</h3>
<div>
[<a href="/index.cgi/contrast/https://www.w3schools.com/cssref/img_5terre.jpg">画像:Cinque Terre</a>]
</div>
<h3>An image with a mask layer (a circle):</h3>
<div>
[<a href="/index.cgi/contrast/https://www.w3schools.com/cssref/img_5terre.jpg">画像:Cinque Terre</a>]
</div>
<h3>An image with a mask layer (an ellipse):</h3>
<div>
[<a href="/index.cgi/contrast/https://www.w3schools.com/cssref/img_5terre.jpg">画像:Cinque Terre</a>]
</div>
<h3>Original image:</h3>
[<a href="/index.cgi/contrast/https://www.w3schools.com/cssref/img_5terre.jpg">画像:Cinque Terre</a>]
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://www.w3schools.com/cssref/tryit.php?filename=trycss3_mask1">(->オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://www.w3schools.com/cssref/tryit.php?filename=trycss3_mask1" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
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</body>
</html>