<body> <h1>prototype.js リファレンス</h1>
The Opera object? Yes the window.opera object. This is a script object that Opera has provided since Opera 5. It is provided to aid debugging of scripts. Many real-world scripts use window.opera to check if the browser is Opera. However, very few of them actually seem to use the properties or methods that are attached to this object. Opera documents many of these itself in its jsconsole.html, but
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