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    <p>Suggestions for 3 approaches</p> <h1>Content script injecting a fixed html element</h1> <p>Yes, the styles if specified are too generic in web pages </p> <p><strong>Ex:</strong> </p> <pre><code>div { border:none; } </code></pre> <p>does effect content script(s) elements even you assign rare combination of id(s) and classes to css, Solution is to specify (or) override all styles using css which is very cumbersome</p> <p><strong>Ex:</strong> Over ride every style which is error prone and cumbersome.</p> <pre><code>html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; font-size: 100%; font: inherit; vertical-align: baseline; } /* HTML5 display-role reset for older browsers */ article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; } body { line-height: 1; } ol, ul { list-style: none; } blockquote, q { quotes: none; } blockquote:before, blockquote:after, q:before, q:after { content: ''; content: none; } table { border-collapse: collapse; border-spacing: 0; } </code></pre> <h1>Content script injecting an iframe.</h1> <p>I suggest this is best approach , regarding your concern on script injection on dynamic iframes; Yes it is possible to inject script to dynamic generated iframes</p> <h2>Sample Implementation</h2> <h3>manifest.json</h3> <pre><code>{ "name": "Iframe", "description": "", "version": "1", "manifest_version": 2, "content_scripts": [ { "matches": [ "&lt;all_urls&gt;" ], "js": [ "myscript.js" ], "run_at": "document_end" }, { "matches": [ "&lt;all_urls&gt;" ], "js": [ "anotherscript.js" ], "all_frames": true } ], "permissions": [ "&lt;all_urls&gt;" ] } </code></pre> <h3>myscript.js</h3> <pre><code>var iframe = document.createElement("iframe"); iframe.setAttribute("src", "https://www.facebook.com/plugins/like.php?href=http://allofrgb.blogspot.in/"); iframe.setAttribute("style", "border:none; width:150px; height:30px"); iframe.setAttribute("scrolling", "no"); iframe.setAttribute("frameborder", "0"); document.body.appendChild(iframe); </code></pre> <h3>anotherscript.js</h3> <pre><code>iframes = document.getElementsByTagName("iframe"); for (iframe in iframes){ console.log(iframes[iframe].src); } console.log("In another Script"); </code></pre> <p>If you observe console logged messages you observe messages are logged twice (<code>document</code> log + <code>iframe</code> log + <code>[any number of optional iframes in pages]*</code>)</p> <p><code>anotherscript.js</code> which runs during <code>document idle</code> states does execute in dynamic generated iframe, how ever you can re-run content script through <a href="https://developer.chrome.com/extensions/tabs.html#method-executeScript" rel="noreferrer">chrome.tabs.executeScript()</a> any time.</p> <h1>Extending the Devtool panel</h1> <p>You have clearly identified problems, so eliminating it as an alternative.</p>
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    1. POHow can a chrome extension add a floating bar at the bottom of pages?
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    1. USSudarshan
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      1. VTUpMod
    1. COInjecting an iframe turned out to be the best practice here. unfortunately I could not get this solution working. In the above example i believe what is happening is the content script with all_frames (anotherscript.js) simply run in the tab containing the iframe, as it should, just like another content script. It did not however run again in the dynamically injected iframe. so it could access the iframe element itself, but not elements inside it.
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      1. USmooli
    2. CO@mooli:It can access elements inside it, can you show code where it did not work, i have thoroughly tested this.
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