[javascript] How to run two jQuery animations simultaneously?

Posting my answer to help someone, the top rated answer didn't solve my qualm.

When I implemented the following [from the top answer], my vertical scroll animation just jittered back and forth:

$(function () {
 $("#first").animate({
   width: '200px'
}, { duration: 200, queue: false });

$("#second").animate({
   width: '600px'
}, { duration: 200, queue: false });
});

I referred to: W3 Schools Set Interval and it solved my issue, namely the 'Syntax' section:

setInterval(function, milliseconds, param1, param2, ...)

Having my parameters of the form { duration: 200, queue: false } forced a duration of zero and it only looked at the parameters for guidance.

The long and short, here's my code, if you want to understand why it works, read the link or analyse the interval expected parameters:

var $scrollDiv = '#mytestdiv';
var $scrollSpeed = 1000;
var $interval = 800;

function configureRepeats() {
   window.setInterval(function () {
       autoScroll($scrollDiv, $scrollSpeed);
   }, $interval, { queue: false });
};

Where 'autoScroll' is:

    $($scrollDiv).animate({
        scrollTop: $($scrollDiv).get(0).scrollHeight
    }, { duration: $scrollSpeed });

    //Scroll to top immediately 
    $($scrollDiv).animate({
        scrollTop: 0
    }, 0);

Happy coding!

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