As you will notice, several features of YouTube work without reloading the page (favorite, rate, share, comments, the new channel design, the right column with video information and related video, ...).
All these features require JavaScript in order to work, i.e. without JavaScript YouTube would be pretty crappy.
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To make a scrolling marquee you need to know a little css and a little javascript (or you can look up jquery marquee and pick one that fits your needs). The basics though, you'll need to learn about javascript animations and change the position of the text over time.
No, there is no need for JavaScript in normal circumstances. There is no need for any programming or scripting languages for web-based programming if you are good with html.But things are rarely that simple. Most websites make use of AJAX and Javascript is essential for it.
You need JavaScript and HTML to make car rental scheme. You might also need a middleware.
In general, no you do not need Java or JavaScript to play music on your computer. However, if you want to hear music played by a website, there's a good chance that it uses one of these technologies to do it, in which case you would need Java or a JavaScript enabled browser.
yes you Can get JavaScript Certification online. Only thing you need to search the online java script certification course online