Do you put jQuery in header or footer?
Although almost all web sites still place Jquery and other javascript on header 😀 , even check stackoverflow.com . I also suggest you to put on before end tag of body. You can check loading time after placing on either places. Script tag will pause your webpage to load further.
Can a jQuery script be deferred in Internet Explorer?
In Internet Explorer, the script may be deferred, but not as much as desired. If a script can be deferred, it can also be moved to the bottom of the page. That will make your web pages load faster. EDIT: Firefox does support the DEFER attribute since version 3.6. Only load jQuery itself in the head, via CDN of course.
When to put jQuery code at bottom of page?
Most jquery code executes on document ready, which doesn’t happen until the end of the page anyway. Furthermore, page rendering can be delayed by javascript parsing/execution, so it’s best practice to put all javascript at the bottom of the page.
Where to place jQuery dependent snippets in HTML?
For your common/shared js files, yes, place them before , but for the exceptions, where it really just makes sense application maintenance-wise to stick a jQuery dependent snippet or file reference right there at that point in the html, do so.
Why does jQuery have to be in the head tag?
There are some libraries that must be loaded before the DOM or CSS, such as polyfills. Modernizr is one such library that must be placed in the head tag. The problem caused by scripts is that they block parallel downloads.
Why do jQuery scripts go at the top of the page?
Finally, it’s just much easier to have script at the top, because you don’t have to worry about whether they’re loaded yet when you need to use them. In summary, I tend to put scripts at the top by default and only consider whether it’s worthwhile moving them to the bottom after the page is complete.