Which attribute is not essential under ?

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→ Which attribute is not essential under ?.. </span> </li> </ul> </nav> <div class="relative my-4 border border-gray-400 rounded-lg dark:border-none mcq_item"> <table class="w-full mcq_table"> <thead class="py-2 bg-gray-100 border-b border-gray-300 dark:bg-gray-900 dark:border-gray-700 font-semibold"> <tr> <td class="rounded-tl-lg w-[36px] pl-3 pt-2.5 align-top dark:text-gray-200"> 1. </td> <td class="py-2 rounded-tr-lg"> <h2 class="text-lg dark:text-gray-300"> Which attribute is not essential under <iframe>? </h2> </td> </tr> </thead> <tbody class="border-b border-gray-300 bg-gray-50 dark:bg-gray-900 dark:border-gray-700"> <tr class="dark:text-gray-300"> <td class="py-2 pl-4">A.</td> <td class="py-2">src</td> </tr> <tr class="dark:text-gray-300"> <td class="py-2 pl-4">B.</td> <td class="py-2">height</td> </tr> <tr class="dark:text-gray-300"> <td class="py-2 pl-4">C.</td> <td class="py-2">width</td> </tr> <tr class="dark:text-gray-300"> <td class="py-2 pl-4">D.</td> <td class="py-2">frameborder</td> </tr> </tbody> <tfoot class="bg-[#eafeea] dark:bg-gray-900 mcq_answer"> <tr> <td colspan="2" class="pt-2 pl-3 dark:text-gray-200"> Answer» E. </td> </tr> </tfoot> <tfoot class="bg-gray-100 dark:bg-gray-900 mcq_show_btn hidden"> <tr> <td colspan="2" class="p-2 text-center"> <button class="show_individual px-2 py-1 text-sm border border-violet-500 rounded text-violet-600 hover:bg-violet-100"> Show Answer </button> </td> </tr> </tfoot> </table> <div class="bg-[#eafeea] px-3 pb-1 rounded-b-lg flex justify-end items-center gap-3 text-slate-600 ans_footer dark:bg-gray-900">  </div> </div>  <br><br> <h2 class="pl-2 font-semibold text-gray-800 border-l-2 rounded-md text-md md:text-xl dark:text-gray-300 border-primary-600"> Discussion </h2> <div class="w-full py-2 bg-white rounded-lg dark:bg-black"> <div class="w-full my-4 space-y-4"> <h3>No Comment Found</h3> <div class="mt-8"> <form action="https://mcqoptions.com/postComment" method="post"> <input type="hidden" name="_token" value="uZm7M0R4mrZnnnAO10rutrvOL4CnXq9oDaWy0qZb" autocomplete="off"> <input type="text" name="name" class="w-full p-3 mb-2 bg-gray-100 border border-gray-400 rounded outline-none focus:ring-2 focus:ring-primary-600 dark:bg-gray-900 dark:text-gray-300" placeholder="Name*" required> <input type="email" name="email" class="w-full p-3 mb-2 bg-gray-100 border border-gray-400 rounded outline-none focus:ring-2 focus:ring-primary-600 dark:bg-gray-900 dark:text-gray-300" placeholder="Email*" required> <input type="hidden" name="q_id" value="223249"> <textarea name="comment" class="w-full p-3 bg-gray-100 border border-gray-400 rounded outline-none focus:ring-2 focus:ring-primary-600 h-28 dark:bg-gray-900 dark:text-gray-300" placeholder="comment*" required> </textarea> <div class="text-xs text-red-500"> </div> <div class="flex justify-end mt-4"> <button type="submit" class="relative inline-flex btn-primary"> <span > Post Comment </span> </button> </div> </form> </div> </div> </div>  <div class="p-2 my-4 text-lg border-gray-400 rounded-lg dark:text-gray-100 relative p-2 mb-3 text-lg border border-gray-200 rounded-lg dark:bg-gray-900 dark:border-none"> <h3 class=" px-2 mb-2 -ml-2 text-xl font-semibold border-l-4 rounded-sm dark:text-gray-100 border-primary-600">Related MCQs</h3> <ul class="flex flex-col gap-2 py-4 pl-8 list-disc dark:text-gray-200"> <li> <a href="https://mcqoptions.com/discussion/attributes-that-allow-to-identify-particular-element-2309328" class="text-gray-600 dark:text-gray-300 "> Attributes that allow to identify particular element are ____________ </a> </li> <li> <a href="https://mcqoptions.com/discussion/which-of-the-following-is-not-an-2309324" class="text-gray-600 dark:text-gray-300 "> Which of the following is not an empty element. </a> </li> <li> <a href="https://mcqoptions.com/discussion/what-is-the-use-of-tag-2309323" class="text-gray-600 dark:text-gray-300 "> What is the use of <hr/> tag? </a> </li> <li> <a 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</li> <li> <a href="https://mcqoptions.com/discussion/which-is-not-the-attribute-of-element-225405" class="text-gray-600 dark:text-gray-300 "> Which is not the attribute of <meta> element? </a> </li> <li> <a href="https://mcqoptions.com/discussion/which-attribute-is-not-essential-under-223249" class="text-gray-600 dark:text-gray-300 "> Which attribute is not essential under <iframe>? </a> </li> </ul> </div> </main> <aside class="py-4 md:w-1/3 lg:w-1/4"> <div class="relative p-2 mb-12 text-lg border border-gray-200 rounded-lg dark:bg-gray-900 dark:border-none"> <div class="flex items-center gap-2 px-2 mb-2 -ml-2 text-xl font-semibold border-l-4 rounded-sm dark:text-gray-100 border-primary-600"> <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" data-slot="icon" class="w-6 h-6"> <path stroke-linecap="round" stroke-linejoin="round" d="M12 6.042A8.967 8.967 0 0 0 6 3.75c-1.052 0-2.062.18-3 .512v14.25A8.987 8.987 0 0 1 6 18c2.305 0 4.408.867 6 2.292m0-14.25a8.966 8.966 0 0 1 6-2.292c1.052 0 2.062.18 3 .512v14.25A8.987 8.987 0 0 0 18 18a8.967 8.967 0 0 0-6 2.292m0-14.25v14.25" /> </svg> <span>Related Topics</span> </div> <div class="flex flex-col gap-2 px-2 font-serif text-md "> <a href="https://mcqoptions.com/topic/elements-attributes-support-web-applications-in-html-3135" class="text-gray-600 dark:text-gray-300 " > Elements Attributes Support Web Applications in Html </a> <hr class="dark:border-gray-600/50"> <a href="https://mcqoptions.com/topic/html5-semantics-youtube-videos-in-html-3167" class="text-gray-600 dark:text-gray-300 " > Html5 Semantics Youtube Videos in Html </a> <hr class="dark:border-gray-600/50"> <a href="https://mcqoptions.com/topic/responsive-overview-in-html-3288" class="text-gray-600 dark:text-gray-300 " > Responsive Overview in Html </a> <hr class="dark:border-gray-600/50"> <a href="https://mcqoptions.com/topic/html-geolocation-in-html-4366" class="text-gray-600 dark:text-gray-300 " > Html 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