{"id":432,"date":"2021-07-14T11:00:00","date_gmt":"2021-07-14T05:30:00","guid":{"rendered":"https:\/\/wpproonline.com\/?p=432"},"modified":"2026-02-26T10:45:55","modified_gmt":"2026-02-26T10:45:55","slug":"chapter-29-iframes","status":"publish","type":"post","link":"https:\/\/www.digitalhubz.com\/blog\/chapter-29-iframes\/","title":{"rendered":"Chapter 29: IFrames"},"content":{"rendered":"\n<figure>\n<table>\n<tbody>\n<tr>\n<td><strong>Attribute<\/strong><\/td>\n<td><strong>Details<\/strong><\/td>\n<\/tr>\n<tr>\n<td><em>name<\/em><\/td>\n<td>Sets the element&#8217;s name, to be used with an a tag to change the iframe&#8217;s <em>src<\/em>.<\/td>\n<\/tr>\n<tr>\n<td><em>width<\/em><\/td>\n<td>Sets the element&#8217;s width in pixels.<\/td>\n<\/tr>\n<tr>\n<td><em>height<\/em><\/td>\n<td>Sets the element&#8217;s height in pixels.<\/td>\n<\/tr>\n<tr>\n<td><em>src<\/em><\/td>\n<td>Specifies the page that will be displayed in the frame.<\/td>\n<\/tr>\n<tr>\n<td><em>srcdoc<\/em><\/td>\n<td>Specifies the content that will be displayed in the frame, assuming the browser supports it. The<br \/>content must be valid HTML.<\/td>\n<\/tr>\n<tr>\n<td><em>sandbox<\/em><\/td>\n<td>When set, the contents of the iframe is treated as being from a unique origin and features<br \/>including scripts, plugins, forms and popups will be disabled. Restrictions can be selectively<br \/>relaxed by adding a space separated list of values. See the table in Remarks for possible values.<\/td>\n<\/tr>\n<tr>\n<td><em>allowfullscreen<\/em><\/td>\n<td>Whether to allow the iframe\u2019s contents to use <em>requestFullscreen<\/em>( )<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n<p><!--more--><\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-basics-of-an-inline-frame\">Basics of an Inline Frame<\/h2>\n\n<p class=\"wp-block-paragraph\">The term &#8220;IFrame&#8221; means Inline Frame. It can be used to include another page in your page. This will yield a small<br \/>frame which shows the exact contents of the base.<em>html<\/em>.<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe src=\"base.html\"&gt;&lt;\/iframe&gt;<\/pre>\n\n<h2 class=\"wp-block-heading\" id=\"h-sandboxing\">Sandboxing<\/h2>\n\n<p class=\"wp-block-paragraph\">The following embeds an untrusted web page with all restrictions enabled<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe sandbox src=\"http:\/\/example.com\/\"&gt;&lt;\/iframe&gt;<\/pre>\n\n<p class=\"wp-block-paragraph\">To allow the page to run scripts and submit forms, add allow-scripts and allow-forms to the sandbox attribute.<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe sandbox=\"allow-scripts allow-forms\" src=\"http:\/\/example.com\/\"&gt;&lt;\/iframe&gt;<\/pre>\n\n<p class=\"wp-block-paragraph\">If there is untrusted content (such as user comments) on the same domain as the parent web page, an iframe can<br \/>be used to disable scripts while still allowing the parent document to interact with it&#8217;s content using <em>JavaScript<\/em>.<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe sandbox=\"allow-same-origin allow-top-navigation\"\nsrc=\"http:\/\/example.com\/untrusted\/comments\/page2\"&gt;<\/pre>\n\n<p class=\"wp-block-paragraph\">The parent document can add event listeners and resize the IFrame to fit its contents. This, along with allow-top\u0002navigation, can make the sandboxed iframe appear to be part of parent document.<\/p>\n\n<p class=\"wp-block-paragraph\">This sandbox is not a replacement for sanitizing input but can be used as part of a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Defense_in_depth_%28computing%29\">defense in depth<\/a> strategy.<\/p>\n\n<p class=\"wp-block-paragraph\">Also be aware that this sandbox can be subverted by an attacker convincing a user to visit the iframe&#8217;s source<br \/>directly. The <a href=\"https:\/\/w3c.github.io\/webappsec-csp\/#directive-sandbox\">Content Security Policy<\/a> HTTP header can be used to mitigate this attack.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-setting-the-frame-size\">Setting the Frame Size<\/h2>\n\n<p class=\"wp-block-paragraph\">The IFrame can be resized using the <em>width<\/em> and <em>height<\/em> attributes, where the values are represented in pixels (HTML<br \/>4.01 allowed percentage values, but HTML 5 only allows values in CSS pixels).<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe src=\"base.html\" width=\"800\" height=\"600\"&gt;&lt;\/iframe&gt;<\/pre>\n\n<h2 class=\"wp-block-heading\" id=\"h-using-the-srcdoc-attribute\">Using the &#8220;srcdoc&#8221; Attribute<\/h2>\n\n<p class=\"wp-block-paragraph\">The srcdoc attribute can be used (instead of the <em>src<\/em> attribute) to specify the exact contents of the iframe as a<br \/>whole HTML document. This will yield an IFrame with the text &#8220;IFrames are cool!&#8221;<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe srcdoc=\"&lt;p&gt;IFrames are cool!&lt;\/p&gt;\"&gt;&lt;\/iframe&gt;<\/pre>\n\n<p class=\"wp-block-paragraph\">If the srcdoc attribute isn&#8217;t supported by the browser, the IFrame will instead fall back to using the <em>src<\/em> attribute,<br \/>but if both the src and srcdoc attributes are present and supported by the browser, srcdoc takes precedence.<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe srcdoc=\"&lt;p&gt;Iframes are cool!&lt;\/p&gt;\" src=\"base.html\"&gt;&lt;\/iframe&gt;<\/pre>\n\n<p class=\"wp-block-paragraph\">In the above example, if the browser does not support the srcdoc attribute, it will instead display the contents of<br \/>the <em>base.html <\/em>page.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-using-anchors-with-iframes\">Using Anchors with IFrames<\/h2>\n\n<p class=\"wp-block-paragraph\">Normally a change of webpage within an Iframe is initiated from with the Iframe, for example, clicking a link inside<br \/>the Ifame. However, it is possible to change an IFrame&#8217;s content from outside the IFrame. You can use an anchor<br \/>tag whose <em>href<\/em> attribute is set to the desired URL and whose <em>target<\/em> attribute is set to the iframe&#8217;s <em>name<\/em> attribute.<\/p>\n\n<pre data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;iframe src=\"webpage.html\" name=\"myIframe\"&gt;&lt;\/iframe&gt;\n&lt;a href=\"different_webpage.html\" target=\"myIframe\"&gt;Change the Iframe content to\ndifferent_webpage.html&lt;\/a&gt;<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Attribute Details name Sets the element&#8217;s name, to be used with an a tag to change the iframe&#8217;s src. width Sets the element&#8217;s width in pixels. height Sets the element&#8217;s&hellip;<\/p>\n","protected":false},"author":1,"featured_media":550,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[73,76,111,77],"tags":[110,112,136,154,113],"class_list":["post-432","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-css","category-html","category-html-5-notes-for-professional","category-javascript","tag-html-5-notes","tag-html-5-tutorial","tag-html-resources","tag-html-with-css","tag-html5"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.9) - 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