Setting SVG start on scroll

I have an animated timeline svg that comes on the last section.

http://chalke-design-ebbca1.webflow.io/our-process

The animation starts as soon as the page is loaded but I want to trigger it only when the users scrolls to that specific part of the page.

Can anyone help!

Thank you in advance!

---

也许你需要这些问题中概述的内容：检查元素是否在屏幕上可见，或者在滚动后检查元素是否可见，即检查问题元素的顶部偏移量是否在屏幕边界内，然后启动你的动画如果条件成立的话。

var theElementInQuestion = document.getElementById("theElementInQuestion");

if (isScrolledIntoView(theElementInQuestion)) {
    startAnimation();
}

function isScrolledIntoView(elem)
{
    var docViewTop = $(window).scrollTop();
    var docViewBottom = docViewTop + $(window).height();

    var elemTop = $(elem).offset().top;
    var elemBottom = elemTop + $(elem).height();

    return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}

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