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ScrollTrigger and prefers-colors-scheme bug

marius96 test
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I'm building a landing page which uses SrollTrigger for a parallax effect and the prefers-color-schemefor triggering dark mode.

My code is working perfectly in the provided CodePen ( use a mobile view when checking the codepen link), but it doesn't in my browser. As you can see here,  when I switch to light mode, my parallax effect is not functioning properly.
I'm using the same version of GSAP ( 3.4.2 ) in CodePen and in my webpack folder. 

See the Pen ExKYbgq by make96 (@make96) on CodePen

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Just now, marius96 said:

The parallax effect is broken when I switch to a light color scheme.

Again, it works on my device no matter what color scheme I have. So it's likely a setup/environment issue. Try it yourself:

<html>
<body>
<link href='https://fonts.googleapis.com/css?family=Signika+Negative:300,400,600' rel='stylesheet' type='text/css'>
<style>

.panel.align-top {
  align-items: flex-start;
}

.panel h1 {
  font-size: 1.8em;
  color: white;
  font-weight: 300;
  margin: 0 auto;
}
.panel.description {
  padding-bottom: 60px;
}
.panel p, .panel li {
  color: black;
  font-weight: 400;
  text-align: left;
  font-size: 0.8em;
  line-height: 1.5em;
  margin: 0.3em 0 1em 0;
}
.panel p strong, .panel li strong {
  color: white;
  font-weight: 400;
}
.panel p code, .panel li code {
  background-color: rgba(255,255,255,0.15);
  padding: 2px 4px;
  border-radius: 5px;
}
.panel li {
  margin: 0;
}
.gray {
  background-color: #777;
  background-image: radial-gradient(circle at 47% 14%, rgba(205, 205, 205,0.04) 0%, rgba(205, 205, 205,0.04) 43%,transparent 43%, transparent 100%),radial-gradient(circle at 35% 12%, rgba(215, 215, 215,0.04) 0%, rgba(215, 215, 215,0.04) 4%,transparent 4%, transparent 100%),radial-gradient(circle at 1% 35%, rgba(24, 24, 24,0.04) 0%, rgba(24, 24, 24,0.04) 37%,transparent 37%, transparent 100%),radial-gradient(circle at 21% 1%, rgba(0, 0, 0,0.04) 0%, rgba(0, 0, 0,0.04) 26%,transparent 26%, transparent 100%),radial-gradient(circle at 23% 82%, rgba(249, 249, 249,0.04) 0%, rgba(249, 249, 249,0.04) 60%,transparent 60%, transparent 100%),radial-gradient(circle at 11% 54%, rgba(251, 251, 251,0.04) 0%, rgba(251, 251, 251,0.04) 23%,transparent 23%, transparent 100%),radial-gradient(circle at 69% 68%, rgba(234, 234, 234,0.04) 0%, rgba(234, 234, 234,0.04) 10%,transparent 10%, transparent 100%),linear-gradient(90deg, #777,#606060);
}
.blue {
  background-color: #2c7ad2;
  background-image: radial-gradient(circle at 47% 14%, rgba(205, 205, 205,0.04) 0%, rgba(205, 205, 205,0.04) 43%,transparent 43%, transparent 100%),radial-gradient(circle at 35% 12%, rgba(215, 215, 215,0.04) 0%, rgba(215, 215, 215,0.04) 4%,transparent 4%, transparent 100%),radial-gradient(circle at 1% 35%, rgba(24, 24, 24,0.04) 0%, rgba(24, 24, 24,0.04) 37%,transparent 37%, transparent 100%),radial-gradient(circle at 21% 1%, rgba(0, 0, 0,0.04) 0%, rgba(0, 0, 0,0.04) 26%,transparent 26%, transparent 100%),radial-gradient(circle at 23% 82%, rgba(249, 249, 249,0.04) 0%, rgba(249, 249, 249,0.04) 60%,transparent 60%, transparent 100%),radial-gradient(circle at 11% 54%, rgba(251, 251, 251,0.04) 0%, rgba(251, 251, 251,0.04) 23%,transparent 23%, transparent 100%),radial-gradient(circle at 69% 68%, rgba(234, 234, 234,0.04) 0%, rgba(234, 234, 234,0.04) 10%,transparent 10%, transparent 100%),linear-gradient(90deg, #2c7ad2,#1568c6);
}
.orange {
  background-color: #e77614;
  background-image: radial-gradient(circle at 46% 40%, rgba(228, 228, 228,0.06) 0%, rgba(228, 228, 228,0.06) 13%,transparent 13%, transparent 100%),radial-gradient(circle at 11% 41%, rgba(198, 198, 198,0.06) 0%, rgba(198, 198, 198,0.06) 19%,transparent 19%, transparent 100%),radial-gradient(circle at 52% 23%, rgba(14, 14, 14,0.06) 0%, rgba(14, 14, 14,0.06) 69%,transparent 69%, transparent 100%),radial-gradient(circle at 13% 85%, rgba(148, 148, 148,0.06) 0%, rgba(148, 148, 148,0.06) 44%,transparent 44%, transparent 100%),radial-gradient(circle at 57% 74%, rgba(232, 232, 232,0.06) 0%, rgba(232, 232, 232,0.06) 21%,transparent 21%, transparent 100%),radial-gradient(circle at 59% 54%, rgba(39, 39, 39,0.06) 0%, rgba(39, 39, 39,0.06) 49%,transparent 49%, transparent 100%),radial-gradient(circle at 98% 38%, rgba(157, 157, 157,0.06) 0%, rgba(157, 157, 157,0.06) 24%,transparent 24%, transparent 100%),radial-gradient(circle at 8% 6%, rgba(60, 60, 60,0.06) 0%, rgba(60, 60, 60,0.06) 12%,transparent 12%, transparent 100%),linear-gradient(90deg, #ff7600, #ff7600);
}

.red {
  background-color: #c82736;
  background-image: radial-gradient(circle at 19% 90%, rgba(190, 190, 190,0.04) 0%, rgba(190, 190, 190,0.04) 17%,transparent 17%, transparent 100%),radial-gradient(circle at 73% 2%, rgba(78, 78, 78,0.04) 0%, rgba(78, 78, 78,0.04) 94%,transparent 94%, transparent 100%),radial-gradient(circle at 45% 2%, rgba(18, 18, 18,0.04) 0%, rgba(18, 18, 18,0.04) 55%,transparent 55%, transparent 100%),radial-gradient(circle at 76% 60%, rgba(110, 110, 110,0.04) 0%, rgba(110, 110, 110,0.04) 34%,transparent 34%, transparent 100%),radial-gradient(circle at 68% 56%, rgba(246, 246, 246,0.04) 0%, rgba(246, 246, 246,0.04) 16%,transparent 16%, transparent 100%),radial-gradient(circle at 71% 42%, rgba(156, 156, 156,0.04) 0%, rgba(156, 156, 156,0.04) 47%,transparent 47%, transparent 100%),radial-gradient(circle at 46% 82%, rgba(247, 247, 247,0.04) 0%, rgba(247, 247, 247,0.04) 39%,transparent 39%, transparent 100%),radial-gradient(circle at 50% 47%, rgba(209, 209, 209,0.04) 0%, rgba(209, 209, 209,0.04) 45%,transparent 45%, transparent 100%),linear-gradient(90deg, #e53949,#cc2232);
}

.purple {
  background-color: #8d3dae;
  background-image: radial-gradient(circle at 47% 14%, rgba(205, 205, 205,0.04) 0%, rgba(205, 205, 205,0.04) 43%,transparent 43%, transparent 100%),radial-gradient(circle at 35% 12%, rgba(215, 215, 215,0.04) 0%, rgba(215, 215, 215,0.04) 4%,transparent 4%, transparent 100%),radial-gradient(circle at 1% 35%, rgba(24, 24, 24,0.04) 0%, rgba(24, 24, 24,0.04) 37%,transparent 37%, transparent 100%),radial-gradient(circle at 21% 1%, rgba(0, 0, 0,0.04) 0%, rgba(0, 0, 0,0.04) 26%,transparent 26%, transparent 100%),radial-gradient(circle at 23% 82%, rgba(249, 249, 249,0.04) 0%, rgba(249, 249, 249,0.04) 60%,transparent 60%, transparent 100%),radial-gradient(circle at 11% 54%, rgba(251, 251, 251,0.04) 0%, rgba(251, 251, 251,0.04) 23%,transparent 23%, transparent 100%),radial-gradient(circle at 69% 68%, rgba(234, 234, 234,0.04) 0%, rgba(234, 234, 234,0.04) 10%,transparent 10%, transparent 100%),linear-gradient(90deg, #8d3dae,#8d3dae);
}
.green {
  background-color: #28a92b;
  background-image: radial-gradient(circle at 46% 40%, rgba(228, 228, 228,0.06) 0%, rgba(228, 228, 228,0.06) 13%,transparent 13%, transparent 100%),radial-gradient(circle at 11% 41%, rgba(198, 198, 198,0.06) 0%, rgba(198, 198, 198,0.06) 19%,transparent 19%, transparent 100%),radial-gradient(circle at 52% 23%, rgba(14, 14, 14,0.06) 0%, rgba(14, 14, 14,0.06) 69%,transparent 69%, transparent 100%),radial-gradient(circle at 13% 85%, rgba(148, 148, 148,0.06) 0%, rgba(148, 148, 148,0.06) 44%,transparent 44%, transparent 100%),radial-gradient(circle at 57% 74%, rgba(232, 232, 232,0.06) 0%, rgba(232, 232, 232,0.06) 21%,transparent 21%, transparent 100%),radial-gradient(circle at 59% 54%, rgba(39, 39, 39,0.06) 0%, rgba(39, 39, 39,0.06) 49%,transparent 49%, transparent 100%),radial-gradient(circle at 98% 38%, rgba(157, 157, 157,0.06) 0%, rgba(157, 157, 157,0.06) 24%,transparent 24%, transparent 100%),radial-gradient(circle at 8% 6%, rgba(60, 60, 60,0.06) 0%, rgba(60, 60, 60,0.06) 12%,transparent 12%, transparent 100%),linear-gradient(90deg, #28a92b, #10a614);
}

html, body {
  margin: 0;
  height: 100%;
  -webkit-overflow-scrolling: touch;
  overflow-scrolling: touch;
  font-family: "Signika Negative", sans-serif, Arial;
}

.panel {
	width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 600;
  font-size: 1.5em;
  text-align: center;
  color: white;
  position: relative;
  box-sizing: border-box;
  padding: 10px;
}

body {
  overflow-x: hidden;
  overflow-y: scroll;
}

h1, h2, p, li {
  max-width: 800px;
}

/* HEADER */
header {
  position: fixed;
  top: 0px;
  left: 0px;
  padding: 6px 10px 10px 10px;
  border-bottom-right-radius: 26px;
  z-index: 100;
  background-color: rgba(0,0,0,0.5);
}

/* HEADINGS */
.header-section {
  padding: 0 15px;
  text-align: center;
  margin: 40vh auto 50vh;
}

/* SCROLL DOWN */ 
.scroll-down {
  position: absolute; 
  bottom: 30px;
  left: 50%;
  transform: translate(-50%, 0);
  color: black;
  font-weight: 400;
  text-transform: uppercase;
  font-size: 16px;
  overflow: visible;
}
.scroll-down .arrow {
  position: relative;
  top: -4px;
  margin: 0 auto;
  width: 20px;
  height: 20px;
  background-image: url(data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA1MTIgNTEyIj4KPHBhdGggZmlsbD0iYmxhY2siIGQ9Ik00ODMuMiwxOTIuMmMtMjAuNS0yMC41LTUzLjUtMjAuOC03My43LTAuNkwyNTcsMzQ0LjFMMTA0LjUsMTkxLjZjLTIwLjItMjAuMi01My4yLTE5LjktNzMuNywwLjYKCWMtMjAuNSwyMC41LTIwLjgsNTMuNS0wLjYsNzMuN2wxOTAsMTkwYzEwLjEsMTAuMSwyMy40LDE1LjEsMzYuOCwxNWMxMy4zLDAuMSwyNi43LTQuOSwzNi44LTE1bDE5MC0xOTAKCUM1MDMuOSwyNDUuNyw1MDMuNywyMTIuNyw0ODMuMiwxOTIuMnoiLz4KPC9zdmc+);
  background-size: contain;
}

</style>
<style>
section {
  width: 100%;
  height: 100%;
}
section .wrapper {
  height: 100%;
  width: 100%;
}
section .wrapper .image-wrapper-mobile {
  width: 100%;
  height: 100%;
  position: absolute;
}

@media (prefers-color-scheme: light) {
  .image-wrapper-mobile-first {
    z-index: -2;
    background: url("https://i.imgur.com/qoEAUG8.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
    -moz-background-size: cover;
  }

  .image-wrapper-mobile-second {
    z-index: -1;
    background: url("https://i.imgur.com/OkcJZUn.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
    -moz-background-size: cover;
  }
}
@media (prefers-color-scheme: dark) {
  .image-wrapper-mobile-first {
    z-index: -2;
    background: url("https://i.imgur.com/Qghnuxz.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
    -moz-background-size: cover;
  }

  .image-wrapper-mobile-second {
    z-index: -1;
    background: url("https://i.imgur.com/HkwWebH.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
    -moz-background-size: cover;
  }
}

</style>
<section class="section-mobile">
  <div class="wrapper wrapper-mobile">
    <div class="image-wrapper-mobile image-wrapper-mobile-first" data-speed="5"></div>
    <div class="image-wrapper-mobile image-wrapper-mobile-second" data-speed="-5"></div>
  </div>
</section>
<section class="section-mobile-second">
  <h1>test</h1>
</section>

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.4.2/gsap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.4.2/ScrollTrigger.min.js"></script>
<script>
gsap.registerPlugin(ScrollTrigger);


let speed = 100;
let scene1 = gsap.timeline({defaults: {ease: "power1.in"}});
ScrollTrigger.create({
  id: 'section-one',
  animation: scene1,
  trigger: "section",
  start: "top top",
  end: "bottom top",
  markers: 1,
  scrub: true
});

gsap.utils.toArray(".image-wrapper-mobile").forEach(elem => {
  scene1.to(elem, { y:  elem.dataset.speed * speed}, 0)
});

</script>

</body>
</html>

Given the lack of information it's pretty hard to help further at this point.

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Indeed, your code is working if I slap it into an .html file.

Even if I run my project in production, I get the same error.

I'll have to look over my webpack config files and keep debugging.

 

Edit: I fixed it! I scrapped all my SCSS code which was responsible for the dark mode and used html tags to switch images based on the color scheme.

 

section
  picture(data-speed = '5')
    source(srcset='images/first-parallax-dark-mobile.png' media='(prefers-color-scheme: dark)')
    img(src='images/second-parallax-light-mobile.png')
  picture(data-speed = '-5')
    source(srcset='images/second-parallax-dark-mobile.png' media='(prefers-color-scheme: dark)')
    img(src='images/first-parallax-light-mobile.png')
section

 

Edited by marius96
Fixed it.
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