JavaScript is a dialect of the standardized ECMAScript programming language, primarily used for scripting web-pages. Use this tag for questions regarding ECMAScript and its dialects/ implementations: JavaScript, JScript, etc., excluding ActionScript.

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26
votes
4answers
5k views

Does “putting Javascript at the bottom” defeat the purpose of document.ready?

I know that it is recommended to put Javascript at the bottom of the page, but if I'm using jQuery doesn't this defeat its purpose to run as the DOM is loading? If I have a dropdown menu, for example,...
11
votes
1answer
183 views

What is the benefit of using Google Analytics' asynchronous tracking code compared to the non-asynchronous code?

What, specifically, does the asynchronous code accomplish or allow that the older code does not?
11
votes
4answers
3k views

Should I combine js/css files into a single file?

Both YSlow and Google's Page Speed add-ons recommend combining script (and style) files into a single file each to reduce the number of HTTP requests, and I can certainly see the point of this when ...
47
votes
16answers
2k views

HTML validation: is it worth it?

What are the advantages and disadvantages (if any) of making sure that all pages validate compared to having non-valid HTML that however works on all major browsers? Also, is having valid HTML after ...
8
votes
9answers
510 views

How do I compress my JavaScript and/or CSS?

I know that there are ways to dynamically load it into the page, but if I want to compress my code so it loads even faster, how do I do it?
7
votes
9answers
1k views

prototype.js or jQuery for new projects?

Should I use prototype.js or jQuery for a new project? Rails comes with prototype.js but jQuery seems the library of choice for the rest of the world. Is prototype.js still under active development? ...
14
votes
5answers
2k views

What's the best way to load Javascript into a page to optimize performance?

Is there a way to load my JavaScript into a page that will make it load faster?
7
votes
2answers
3k views

What are the differences between Firefox's Javascript engine and Chrome's V8?

I've noticed that Chrome and Firefox take different amounts of time to render certain things. In general, Chrome has been faster. What should I know about both of them (and IE8/9, too, I guess) when ...
24
votes
4answers
3k views

Why insert static files (CSS, images, JavaScript, ECC) in a subdomain?

Why so many big and little sites inserts static files (CSS, images, JavaScript, ECC) in a subdomain like media.example.com or s2.static.example.com? What are the advantages? Why not just a directory ...
5
votes
2answers
106 views

Browser privacy improvement implications for websites

On https://panopticlick.eff.org/ EFF let you test the number of uniquely identifying bits that the browser gives a website. Among these are HTTP header fields such as User-Agent, Accept, Accept-...