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PORetrieving HTML attribute values "the DOM 0 way"
 

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    <p>jQuery has an <code>attr()</code> method which retrieves the value of a given HTML attribute. For instance:</p> <pre><code>var foo = document.getElementById("foo"); $(foo).attr("id"); </code></pre> <p>But, performance-wise this is not optimal since an jQuery object has to be created just to call the <code>attr()</code> method. This performs better: <code>foo.id</code>.</p> <p>So, ideally we would want to avoid using <code>attr()</code>. But, can we do that (for any attribute)? I believe <code>foo.id</code> and <code>foo.value</code> is "safe" (cross-browser), but I remember having issues with <code>foo.href</code>.</p> <p>Here is a list of various attributes that I would like to be able to retrieve "directly":</p> <p>For any element: <code>foo.id</code>, <code>foo.name</code><br> For anchors: <strong><code>foo.href</code></strong>, <code>foo.target</code>, <code>foo.rel</code><br> For images, objects, iframes: <strong><code>foo.src</code></strong>, <code>foo.width</code>, <code>foo.height</code><br> For form elements: <code>foo.checked</code>, <strong><code>foo.selected</code></strong>, <code>foo.disabled</code>, <code>foo.readonly</code>, <code>foo.type</code>, <code>foo.value</code>, <code>foo.action</code></p> <p>So the question is: Are the above expressions cross-browser? Can I use them safely? </p> <p>A link to an article which examines this issue would also be nice.</p> <p><strong>Edit (based on the answers):</strong> The expressions in bold are not safe to use!</p>
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