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The Document-Object Model -- Eloquent JavaScript
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Document Object Model JavaScript Book
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Document Object Model - Wikipedia
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HTML body Tag - javatpoint
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How to find and get HTML Elements in JavaScript
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How to get elements from the DOM in JavaScript
Select a DOM Element with document.getElementById | egghead.io
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html - Cannot get <body> element to cover entire page - Stack Overflow
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Get the body element as HTMLBodyElement using document.body in JavaScript
