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What is the principle of iframe

小老鼠

Aug 23, 2023 pm 05:35 PM

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The principle of iframe is to insert an tag into an HTML document and set the src attribute to point to the URL of the web page or document to be embedded. When the browser parses the <iframe> tag, it creates a separate browsing context, loads the specified URL, and displays its content in an embedded frame. This frame can set properties such as width, height, and borders to control its display on the page. </p></blockquote> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/202308/23/2023082317340086961.jpg" class="lazy" alt="What is the principle of iframe" ></p> <p>The operating environment of this tutorial: Windows 10 system, Dell G3 computer. </p> <p>iframe (inline frame) is a tag in HTML used to embed other web pages or documents in a web page. It allows developers to embed a web page into another web page, thereby displaying multiple independent content on the same page. This embedding method can display content from other websites, advertisements, maps, etc. in the web page. </p> <p>The principle of iframe is to insert an <iframe> tag into an HTML document and set the src attribute to point to the URL of the web page or document to be embedded. When the browser parses the <iframe> tag, it creates a separate browsing context, loads the specified URL, and displays its content in an embedded frame. This frame can set properties such as width, height, and borders to control its display on the page. </p> <p>In an iframe, the embedded web page or document can run independently from the main page and has its own DOM structure, CSS style and JavaScript execution environment. This means that content from other websites can be loaded and displayed in the iframe without being affected by the main page. At the same time, iframe also provides some attributes and methods that can interact with embedded pages through JavaScript, such as obtaining the content of the embedded page, modifying its style, calling its methods, etc. </p> <p>However, due to the independence of iframe, it also has some security and performance issues. First, since iframes can load content from other websites, there may be security issues with cross-domain access. To solve this problem, browsers usually restrict access to iframes, such as prohibiting cross-domain scripts from accessing embedded pages. Secondly, since the content loaded by iframe is independent, it requires additional network requests and resource loading, which may affect the loading speed and performance of the page. </p> <p>Therefore, you need to pay attention to some issues when using iframe. First, you should ensure that the embedded content is trustworthy to avoid security risks. Secondly, iframes should be used rationally and avoid excessive nesting and overuse to reduce the impact on page performance. Finally, if you need to interact with embedded pages, you should use secure methods to avoid potential security vulnerabilities. </p> <p>In summary, an iframe is a tag that embeds other web pages or documents in a web page, and loads and displays the embedded content by creating an independent browsing context. It provides a flexible way to display multiple independent content, but also requires attention to security and performance issues. </p><p>The above is the detailed content of What is the principle of iframe. For more information, please follow other related articles on the PHP Chinese website!</p> </div> </div> <div class="wzconShengming_sp"> <div class="bzsmdiv_sp">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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Loading sequence, etc.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/599101.html" title="What does data-id in iframe mean?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202308/28/2023082814252193959.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What does data-id in iframe mean?" /> </a> <a href="https://www.php.cn/faq/599101.html" title="What does data-id in iframe mean?" class="phphistorical_Version2_mids_title">What does data-id in iframe mean?</a> <span class="Articlelist_txts_time">Aug 28, 2023 pm 02:25 PM</span> <p class="Articlelist_txts_p">The data-id in an iframe refers to a custom attribute used in HTML tags to store the identifier of a specific element. By using the data-id attribute, you can add a unique identifier to the iframe element so that it can be manipulated and accessed in JavaScript. The naming of the data-id attribute can be customized according to specific needs, but some naming conventions are usually followed to ensure its uniqueness and readability. The data-id attribute can also be used to identify and manipulate a specific iframe.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/520600.html" title="Microsoft: Outlook error downloads 'TokenFactoryIframe' file on every visit" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/000/164/168186390343243.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Microsoft: Outlook error downloads 'TokenFactoryIframe' file on every visit" /> </a> <a href="https://www.php.cn/faq/520600.html" title="Microsoft: Outlook error downloads 'TokenFactoryIframe' file on every visit" class="phphistorical_Version2_mids_title">Microsoft: Outlook error downloads 'TokenFactoryIframe' file on every visit</a> <span class="Articlelist_txts_time">Apr 19, 2023 am 08:25 AM</span> <p class="Articlelist_txts_p">Microsoft Outlook is downloading a mysterious file called "TokenFactoryIframe" on macOS when users access the email service through the Safari browser. This issue has now been widely reported by users who have discovered "TokenFactoryIframe" files that Outlook downloads on every visit. Outlook downloads this mysterious file every few seconds or at least every time you access Outlook on Apple platforms. Based on our findings, this appears to be an issue caused by an incorrect server-side update posted to Outlook and has nothing to do with Safari or macOS. Microsoft in a copy</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/595827.html" title="What technology can replace iframe" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202308/24/2023082413541968774.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What technology can replace iframe" /> </a> <a href="https://www.php.cn/faq/595827.html" title="What technology can replace iframe" class="phphistorical_Version2_mids_title">What technology can replace iframe</a> <span class="Articlelist_txts_time">Aug 24, 2023 pm 01:53 PM</span> <p class="Articlelist_txts_p">Technologies that can replace iframes include Ajax, JavaScript libraries or frameworks, Web component technologies, front-end routing, and server-side rendering. Detailed introduction: 1. Ajax is a technology used to create dynamic web pages. It can realize asynchronous update of the page by exchanging data with the server in the background without refreshing the entire page. Using Ajax can load and display content more flexibly, and there is no need to use iframe to embed other pages; 2. JavaScript library or framework , such as React and so on.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/599086.html" title="What are the loading events of iframe?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202308/28/2023082813514630803.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What are the loading events of iframe?" /> </a> <a href="https://www.php.cn/faq/599086.html" title="What are the loading events of iframe?" class="phphistorical_Version2_mids_title">What are the loading events of iframe?</a> <span class="Articlelist_txts_time">Aug 28, 2023 pm 01:55 PM</span> <p class="Articlelist_txts_p">The loading events of iframe include onload event, onreadystatechange event, onbeforeunload event, onerror event, onabort event, etc. Detailed description: 1. onload event, specifying the JavaScript code to be executed after loading the iframe; 2. onreadystatechange event, specifying the JavaScript code to be executed when the iframe state changes, etc.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/596547.html" title="What does iframe mean in Python?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202308/25/2023082515190938735.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What does iframe mean in Python?" /> </a> <a href="https://www.php.cn/faq/596547.html" title="What does iframe mean in Python?" class="phphistorical_Version2_mids_title">What does iframe mean in Python?</a> <span class="Articlelist_txts_time">Aug 25, 2023 pm 03:24 PM</span> <p class="Articlelist_txts_p">iframe in Python is an HTML tag used to embed another web page or document in a web page. In Python, you can use various libraries and frameworks to process and manipulate iframes, the most commonly used of which is the BeautifulSoup library, which can easily extract the content of an iframe from a web page and manipulate and process it. Knowing how to handle and manipulate iframes is extremely useful for both web development and data scraping.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/604434.html" title="What's the danger in iframes" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202309/08/2023090815142962875.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What's the danger in iframes" /> </a> <a href="https://www.php.cn/faq/604434.html" title="What's the danger in iframes" class="phphistorical_Version2_mids_title">What's the danger in iframes</a> <span class="Articlelist_txts_time">Sep 08, 2023 pm 03:14 PM</span> <p class="Articlelist_txts_p">The dangers in iframes mainly include: 1. Security vulnerabilities. Malicious web pages can load other web pages through iframes and carry out some attacks; 2. Same-origin policy breakthrough. By loading web pages under other domain names in iframes, the same-origin policy can be breached. strategy to achieve cross-domain communication, which may be maliciously attacked; 3. Code execution issues, web pages loaded in iframes can execute JS code, which may cause some security issues; 4. SEO issues, search engines may not be able to correctly parse and Index content loaded via iframe and more.</p> </div> </div> </div> </div> </div> </main> <footer> <div class="footer"> <div class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div class="footermid"> <a href="https://www.php.cn/about/us.html">About us</a> <a href="https://www.php.cn/about/disclaimer.html">Disclaimer</a> <a href="https://www.php.cn/update/article_0_1.html">Sitemap</a> </div> <div class="footerbottom"> <p> © php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <script>layui.use(['element', 'carousel'], function () {var element = layui.element;$ = layui.jquery;var carousel = layui.carousel;carousel.render({elem: '#test1', width: '100%', height: '330px', arrow: 'always'});$.getScript('/static/js/jquery.lazyload.min.js', function () {$("img").lazyload({placeholder: "/static/images/load.jpg", effect: "fadeIn", threshold: 200, skip_invisible: false});});});</script> <script src="/static/js/common_new.js"></script> <script type="text/javascript" src="/static/js/jquery.cookie.js?1744796689"></script> <script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script> <link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css?2' type='text/css' media='all' /> <script type='text/javascript' src='/static/js/viewer.min.js?1'></script> <script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script> <script type="text/javascript" src="/static/js/global.min.js?5.5.53"></script> <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function () { var u = "https://tongji.php.cn/"; _paq.push(['setTrackerUrl', u + 'matomo.php']); _paq.push(['setSiteId', '9']); var d = document, g = d.createElement('script'), s = d.getElementsByTagName('script')[0]; g.async = true; g.src = u + 'matomo.js'; s.parentNode.insertBefore(g, s); })(); </script> <script> // top layui.use(function () { var util = layui.util; util.fixbar({ on: { mouseenter: function (type) { layer.tips(type, this, { tips: 4, fixed: true, }); }, mouseleave: function (type) { layer.closeAll("tips"); }, }, }); }); document.addEventListener("DOMContentLoaded", (event) => { // 定义一个函数来处理滚动链接的点击事件 function setupScrollLink(scrollLinkId, targetElementId) { const scrollLink = document.getElementById(scrollLinkId); const targetElement = document.getElementById(targetElementId); if (scrollLink && targetElement) { scrollLink.addEventListener("click", (e) => { e.preventDefault(); // 阻止默认链接行为 targetElement.scrollIntoView({ behavior: "smooth" }); // 平滑滚动到目标元素 }); } else { console.warn( `Either scroll link with ID '${scrollLinkId}' or target element with ID '${targetElementId}' not found.` ); } } // 使用该函数设置多个滚动链接 setupScrollLink("Article_Details_main1L2s_1", "article_main_title1"); setupScrollLink("Article_Details_main1L2s_2", "article_main_title2"); setupScrollLink("Article_Details_main1L2s_3", "article_main_title3"); setupScrollLink("Article_Details_main1L2s_4", "article_main_title4"); setupScrollLink("Article_Details_main1L2s_5", "article_main_title5"); setupScrollLink("Article_Details_main1L2s_6", "article_main_title6"); // 可以继续添加更多的滚动链接设置 }); window.addEventListener("scroll", function () { var fixedElement = document.getElementById("Article_Details_main1Lmain"); var scrollTop = window.scrollY || document.documentElement.scrollTop; // 兼容不同浏览器 var clientHeight = window.innerHeight || document.documentElement.clientHeight; // 视口高度 var scrollHeight = document.documentElement.scrollHeight; // 页面总高度 // 计算距离底部的距离 var distanceToBottom = scrollHeight - scrollTop - clientHeight; // 当距离底部小于或等于300px时，取消固定定位 if (distanceToBottom <= 980) { fixedElement.classList.remove("Article_Details_main1Lmain"); fixedElement.classList.add("Article_Details_main1Lmain_relative"); } else { // 否则，保持固定定位 fixedElement.classList.remove("Article_Details_main1Lmain_relative"); fixedElement.classList.add("Article_Details_main1Lmain"); } }); </script> </body> </html>