Is it okay to insert an into the page's content?</a></h1> </div> <div class="grid fw-wrap pb8 mb16 bb bc-black-075"> <div class="grid--cell ws-nowrap mr16 mb8" title="2016-01-12 19:07:53Z"> <span class="fc-light mr2">Asked</span> <time itemprop="dateCreated" datetime="2013-05-17T20:20:17.333" class="fromnow">May 17 '13 at 20:20</time> </div> <div class="grid--cell ws-nowrap mr16 mb8"> <span class="fc-light mr2">Active</span> <time class="fromnow" title="2013-05-18T19:41:42.310" datetime="2013-05-18T19:41:42.310">May 18 '13 at 19:41</a> </div> <div class="grid--cell ws-nowrap mb8" title="Viewed 1,311 times"> <span class="fc-light mr2">Viewed</span> 1,311 times </div> </div> <div id="mainbar" role="main" aria-label="questions and answers"> <div id="question" class="question" data-questionid="16617261" data-ownerid="1091378" data-score="1"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container grid jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="16617261"> <button class="js-vote-up-btn grid--cell s-btn s-btnunset c-pointer"><svg aria-hidden="true" class="m0 svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 26h32L18 10 2 26z"></path></svg></button> <div class="js-vote-count grid--cell fc-black-500 fs-title grid fd-column ai-center" itemprop="upvoteCount" data-value="1">1</div> <button class="js-bookmark-btn s-btn s-btnunset c-pointer py4"> <svg aria-hidden="true" class="svg-icon iconBookmark" width="18" height="18" viewBox="0 0 18 18"><path d="M6 1a2 2 0 00-2 2v14l5-4 5 4V3a2 2 0 00-2-2H6zm3.9 3.83h2.9l-2.35 1.7.9 2.77L9 7.59l-2.35 1.7.9-2.76-2.35-1.7h2.9L9 2.06l.9 2.77z"></path></svg> <div class="js-bookmark-count mt4" data-value=""></div> </button> </div> </div> <div class="postcell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"><p>Using a content script, I plan to insert a UI into the page in an <code><iframe></code>, but I have a few concerns.</p> <ul> <li>Do people commonly use settings/extensions to block <code>iframe</code>s on the page?</li> <li>If my extension's <code>iframe</code> is blocked, is there a way for me to detect this?</li> <li>Any other reasons to avoid the use of <code>iframe</code>s in this scenario?</li> </ul> <p>There are similar questions on the site, but they don't specifically ask what I want to know.</p> <p>[The reason I want to use an <code>iframe</code> is this: My extension has to run independently of the website loaded (i.e. on any webpage). Its content script needs to show a UI for settings/help etc. Currently it does so by inserting a div into the page's DOM. However CSS from the webpage gets applied to the extension's UI, something which is harder to fix than one would think. Using an <code><iframe></code> seems to a way to avoid this issue.]</p></div> <div class="mt24 mb12"> <div class="post-taglist grid gs4 gsy fd-column"> <div class="grid ps-relative"> <a href="../../questions/tagged/iframe" class="post-tag js-gps-track" title="show questions tagged 'iframe'" rel="tag">iframe</a> <a href="../../questions/tagged/google-chrome-extension" class="post-tag js-gps-track" title="show questions tagged 'google-chrome-extension'" rel="tag">google-chrome-extension</a> <a href="../../questions/tagged/content-script" class="post-tag js-gps-track" title="show questions tagged 'content-script'" rel="tag">content-script</a> </div> </div> </div> <div class="mb0"> <div class="mt16 grid gs8 gsy fw-wrap jc-end ai-start pt4 mb16"> <div class="grid--cell mr16 fl1 w96"></div> <div class="post-signature grid--cell"> <div class="user-info "> <div class="user-action-time">edited <span title="2013-05-18T19:41:42.310" class="relativetime">May 18 '13 at 19:41</span></div> <div class="user-gravatar32"></div> <div class="user-details" itemprop="author" itemscope="" itemtype="http://schema.org/Person"> <span class="d-none" itemprop="name">Himanshu P</span> <div class="-flair"></div> </div> </div> </div> <div class="post-signature owner grid--cell"> <div class="s-user-card s-user-card"> <time class="s-user-card--time" datetime="asked May 17 '13 at 20:20">asked May 17 '13 at 20:20</time> <a href="../../users/1091378/himanshu-p" class="s-avatar s-avatar32 s-user-card--avatar"> <img class="s-avatar--image" src="../../users/profiles/1091378.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Himanshu P" /> </a> <div class="s-user-card--info"> <a href="../../users/1091378/himanshu-p" class="s-user-card--link">Himanshu P</a> <ul class="s-user-card--awards"> <li class="s-user-card--rep" title="reputation score">9,586</li> <li class="s-award-bling s-award-blinggold" title="6 gold badges">6</li> <li class="s-award-bling s-award-blingsilver" title="37 silver badges">37</li> <li class="s-award-bling s-award-blingbronze" title="46 bronze badges">46</li> </ul> </div> </div> </div> </div> </div> </div> <div class="post-layout--right js-post-comments-component"> </div> </div> </div> <div id="answers"> <a name="tab-top"></a> <div id="answers-header"> <div class="answers-subheader grid ai-center mb8"> <div class="grid--cell fl1"> <h2 class="mb0" data-answercount="9">2 Answers<span style="display:none;" itemprop="answerCount">2</span></h2> </div> </div> </div> <a name="16617984"></a> <div id="answer-16617984" class="answer accepted-answer" data-answerid="16617984" data-ownerid="972891" data-score="0" itemprop="acceptedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container grid jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="16617984"> <button class="js-vote-up-btn grid--cell s-btn s-btn__unset c-pointer"><svg aria-hidden="true" class="m0 svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 26h32L18 10 2 26z"></path></svg></button> <div class="js-vote-count grid--cell fc-black-500 fs-title grid fd-column ai-center" itemprop="upvoteCount" data-value="0">0</div> <div class="js-accepted-answer-indicator grid--cell fc-green-500 py6 mtn8"><div class="ta-center"><svg aria-hidden="true" class="svg-icon iconCheckmarkLg" width="36" height="36" viewBox="0 0 36 36"><path d="m6 14 8 8L30 6v8L14 30l-8-8v-8z"></path></svg></div></div> </div> </div> <div class="postcell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"><p>As you've discovered, trying to sandbox your CSS from interference, when injecting into the DOM is very difficult without declaratively setting every known style attribute. It's a well documented problem and some solutions can be found in the following posts:</p> <ul> <li><p><a href="../../questions/3540927/how-do-i-prevent-css-interference-in-an-injected-piece-of-html">How do I prevent CSS interference in an injected piece of HTML?</a></p></li> <li><p><a href="../../questions/3529513/is-there-a-way-to-sandbox-an-html-block-away-from-its-page-s-css-without-using">Is there a way to "sandbox" an HTML block away from its page's CSS without using iframes?</a></p></li> </ul> <p>There's nothing fundamentally wrong with dropping your UI it into an <code><iframe></code>. I'm not aware of any settings or extension that would block this behaviour.</p> <p>If your framed UI needs to interact with the DOM on the parent page or a content script you can do so with the use of <a class="external-link" href="https://developer.mozilla.org/en-US/docs/Web/API/window.parent?redirectlocale=en-US&redirectslug=DOM/window.parent" rel="nofollow noreferrer">Window.Parent</a>. Also you may need to consider <a class="external-link" href="http://en.wikipedia.org/wiki/Same_origin_policy" rel="nofollow noreferrer">Same-Origin Policy</a> if your pulling in the UI from another domain.</p></div> <div class="mb0"> <div class="mt16 grid gs8 gsy fw-wrap jc-end ai-start pt4 mb16"> <div class="grid--cell mr16 fl1 w96"></div> <div class="post-signature grid--cell"> <div class="s-user-card s-user-card"> <time class="s-user-card--time" datetime="edited May 23 '17 at 12:32">edited May 23 '17 at 12:32</time> <a href="../../users/-1/community" class="s-avatar s-avatar32 s-user-card--avatar"> <img class="s-avatar--image" src="../../users/profiles/-1.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Community" /> </a> <div class="s-user-card--info"> <a href="../../users/-1/community" class="s-user-card--link">Community</a> <ul class="s-user-card--awards"> <li class="s-user-card--rep" title="reputation score">1</li> <li class="s-award-bling s-award-blingsilver" title="1 silver badges">1</li> </ul> </div> </div> </div> <div class="post-signature grid--cell"> <div class="s-user-card s-user-card"> <time class="s-user-card--time" datetime="answered May 17 '13 at 21:10">answered May 17 '13 at 21:10</time> <a href="../../users/972891/qfdev" class="s-avatar s-avatar32 s-user-card--avatar"> <img class="s-avatar--image" src="../../users/profiles/972891.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="QFDev" /> </a> <div class="s-user-card--info"> <a href="../../users/972891/qfdev" class="s-user-card--link">QFDev</a> <ul class="s-user-card--awards"> <li class="s-user-card--rep" title="reputation score">8,668</li> <li class="s-award-bling s-award-blinggold" title="14 gold badges">14</li> <li class="s-award-bling s-award-blingsilver" title="58 silver badges">58</li> <li class="s-award-bling s-award-blingbronze" title="85 bronze badges">85</li> </ul> </div> </div> </div> </div> </div> </div> <div class="post-layout--right js-post-comments-component"> </div> </div> </div> <a name="16618093"></a> <div id="answer-16618093" class="answer " data-answerid="16618093" data-ownerid="331508" data-score="0" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container grid jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="16618093"> <button class="js-vote-up-btn grid--cell s-btn s-btnunset c-pointer"><svg aria-hidden="true" class="m0 svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 26h32L18 10 2 26z"></path></svg></button> <div class="js-vote-count grid--cell fc-black-500 fs-title grid fd-column ai-center" itemprop="upvoteCount" data-value="0">0</div> </div> </div> <div class="postcell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"><p>Answers in order:</p> <ol> <li><p>People <a class="external-link" href="https://superuser.com/search?q=title:iframe">do not commonly use settings/extensions to block iFrames</a>. Rather the opposite; the biggest complaint is how to get content out of iframes placed by ISP's and leach/wrapper sites, etc.</p></li> <li><p>Yes, you can detect if your iFrame is blocked by having your iFrame's JS send an "I've started" message. If the message is not detected, assume the worst. :)</p></li> <li><p>No reasons to avoid iFrames, other than they are a bit of a PITA to work with. If you just need to "show a UI for settings/help etc.", then it might be better to have your extension just open one of <a href="../../questions/10340481/popup-window-in-chrome-extension">the popup window types available to extensions</a>. You control the HTML/CSS/JS of those completely without worry of interference by the page.</p></li> </ol></div> <div class="mb0"> <div class="mt16 grid gs8 gsy fw-wrap jc-end ai-start pt4 mb16"> <div class="grid--cell mr16 fl1 w96"></div> <div class="post-signature grid--cell"> <div class="s-user-card s-user-card"> <time class="s-user-card--time" datetime="edited May 23 '17 at 12:32">edited May 23 '17 at 12:32</time> <a href="../../users/-1/community" class="s-avatar s-avatar32 s-user-card--avatar"> <img class="s-avatar--image" src="../../users/profiles/-1.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Community" /> </a> <div class="s-user-card--info"> <a href="../../users/-1/community" class="s-user-card--link">Community</a> <ul class="s-user-card--awards"> <li class="s-user-card--rep" title="reputation score">1</li> <li class="s-award-bling s-award-blingsilver" title="1 silver badges">1</li> </ul> </div> </div> </div> <div class="post-signature grid--cell"> <div class="s-user-card s-user-card"> <time class="s-user-card--time" datetime="answered May 17 '13 at 21:19">answered May 17 '13 at 21:19</time> <a href="../../users/331508/brock-adams" class="s-avatar s-avatar32 s-user-card--avatar"> <img class="s-avatar--image" src="../../users/profiles/331508.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Brock Adams" /> </a> <div class="s-user-card--info"> <a href="../../users/331508/brock-adams" class="s-user-card--link">Brock Adams</a> <ul class="s-user-card--awards"> <li class="s-user-card--rep" title="reputation score">90,639</li> <li class="s-award-bling s-award-blinggold" title="22 gold badges">22</li> <li class="s-award-bling s-award-blingsilver" title="233 silver badges">233</li> <li class="s-award-bling s-award-bling__bronze" title="295 bronze badges">295</li> </ul> </div> </div> </div> </div> </div> </div> <div class="post-layout--right js-post-comments-component"> </div> </div> </div> </div> </div> </div> </div> <script src="../../static/js/stack-icons.js"></script> <script src="../../static/js/fromnow.js"></script> </body> </html>