为的内容启用额外的限制in HTML?</h1> <div class="qa_category"> <div id="divCategories"> <a href='https://tutorialspoint.com/articles/category/HTML' target='_blank'><span>HTML</span></a><a href='https://tutorialspoint.com/articles/category/Web-Development' target='_blank'><span>Web Development</span></a><a href='https://tutorialspoint.com/articles/category/Front-End-Technology' target='_blank'><span>Front End Technology</span></a></div> </div> <hr/> <div id="ezoic-pub-ad-placeholder-132" style="text-align:center !important;overflow: hidden; max-height:99px;min-height:99px"></div> <script> ezstandalone.cmd.push(function() { ezstandalone.showAds(132); }); </script> <p><p style="">Use the <em>sandbox </em>attribute to enable an extra set of restrictions for the content in an <iframe> in HTML.</p><h2>Example</h2><p>You can try to run the following code to implement <em>sandbox </em>attribute −</p><pre class="prettyprint notranslate"><!DOCTYPE html> <html>    <body>       <iframe src = "new.htm" sandbox>          <p>Your browser does not support iframes.</p>       </iframe>    </body> </html></pre></p> <div class="clear"></div> <div class="qa_widget mui-panel prof-view-artcle"> <div class=""> <a href='https://tutorialspoint.com/authors/Giri-Raju' target='_blank' title="Giri Raju" class="mui--pull-left"> <img class="profile-img1" src='https://tutorialspoint.com/assets/profiles/13536/profile/60_72105-1512540773.jpg' alt='Giri Raju'/> </a> <div class="qa_author"> <a href='https://tutorialspoint.com/authors/Giri-Raju' target='_blank'><span>Giri Raju</span></a> <p class="prof-desigtn mb-0"><b></b></p> </div> </div> <div class="clear"></div> <div class="library-page-bottom-nav" id="divStats" data-qid="6985" data-quid = "13536" style="margin-block: 1rem !important;padding-top: 18px;align-items: center; border-top: 1px dashed #ccc;font-size: 14px;"> <div><span class="date">Updated on: </span>01-Jun-2020</div> <div class="flex-group"> <div 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