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Display mobile view of website to user by giving URL

I want to show users how their internet site appearance in the cell so for this cause, I used iframe in my internet site to load their internet site with the aid of giving URL however for a few security motives websites no longer loaded there are cors coverage issues. I also use curl but a few documents not loading due to protection. Is there any API or right way to load like in a real cell device?

<form method="get">

  <input name="website_url" type="url">

  <input type="submit">

</form>

<iframe src="<?=$_GET['website_url']?>"></iframe>