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Asked: 2026-05-25T15:21:32+00:00

I have found a javascript function that inverts colors on webpage: String javascript =

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I have found a javascript function that inverts colors on webpage:

String javascript = "javascript: (function (){var newSS, styles = '* { background-color: black ! important; color: green !important; }a:link, a:link * { color: green !important; text-style: underline; }a:visited, a:visited * { color: #7f0000 !important; }a:hover, a:hover * { color: red !important; }';var elemHead = document.getElementsByTagName(\"head\")[0];var elemCSS = document.getElementById(\"darkenCSS\");if (elemCSS){elemHead.removeChild(elemCSS);}else{newSS = document.createElement('link');newSS.rel = 'stylesheet';newSS.href = 'data:text/css,' + escape(styles);newSS.id = \"darkenCSS\";elemHead.appendChild(newSS);}})();";

Is it possible to run this automatically?
By that I mean load http://www.google.co.uk and apply this javascript function.4

Hope that makes sense, I don’t know much about javascript.

CLARIFICATION:

I want to know if this javascript function can be appended to a URL at all. Something like http://www.google.com/?Javascript_blah_blah_blah

FURTHER CLARIFICATION:

I am making a basic web browser in Android. I want to invert colours on the webpage.
I have made a button, that executes this javascript on the page. This works. But needs the user to press the button each time.

I want to make a switch to make permanently inverted.

So I need to browse to the url input and have it invert the colours automatically.

Hope this helps

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1 Answer

  1. Editorial Team

    No, you can’t “just run” javascript appended to a URL. This is security breach (will be). But you can use

    • bookmarklets (‘URL’ that begins with javascript:),
    • browser plugins (Chrome/FF/Safari – all can do this) or
    • you can look for plugin that can run userscripts. This is something like Greasemonkey.

    Also you can try Fluid (Site Specific Browser, MacOS X only)… I think you get an idea.

    BTW if you want/need to write bookmarlet you can run on specific site and want something to start – check this article: http://coding.smashingmagazine.com/2010/05/23/make-your-own-bookmarklets-with-jquery/

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