<p>
To learn AJAX, you must be <mark>familiar</mark> with the XML<wbr>Http<wbr>Request Object.
</p>
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<p>
To learn AJAX, you must be <mark>familiar</mark> with the XML<wbr>Http<wbr>Request Object.
</p>This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.