What are the potential pitfalls of not using quotation marks for the src attribute in an iframe when embedding a URL code?

Not using quotation marks for the src attribute in an iframe when embedding a URL code can lead to syntax errors or unexpected behavior in the code. To solve this issue, always make sure to enclose the URL in double quotation marks to ensure proper parsing and execution of the code. 

<iframe src="<?php echo $url; ?>" width="100%" height="500"></iframe>

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iframe src attribute URL code quotation marks pitfalls

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