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I tried this command in REPL with the Google home page open & it executed fine i.e.it hid the Google logo - Element By Id('logo').style.visibility = 'hidden'; Thank you for your interest in this question.So be sure to read the comments for links and further info on this topic.If you’re a beginner and you’re developing HTML and CSS using an external stylesheet, you might notice that in some browsers, under some circumstances, the changes you’ve made to your CSS don’t take effect immediately. 19/2011): This article started out as a basic tip but there have been some great comments added for those interested in delving into the topic of caching even more.
Update: It appears that the REPL tab under the Scripts tab in Opera Dragonfly in Opera 11 is similar to the Console option that was available in previous Opera versions.
I did not found much documentation on REPL after a cursory search, except for this article which has an indirect reference.
You could add many types of characters to the query string value, but numbers are a logical way to do it, because then you can just increase the number, and even add decimal places if you want.
And of course, if you don’t change the value for a while, the browser will continue to cache (or preserve) the file, and won’t attempt to download it unless other factors force it to, or you end up updating the query string value.