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CSS

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HTML 

              
                header.parallax
  div.parallax-fg
    h1 This is a test of that no-JS parallax effect <br><small>(without using background-images)</small>
  div.parallax-bg
    h3 this should be in the background
    p Some random text to put behind the main content, showing this method works for arbitrary HTML.
section
  h2 Some second heading
  p This code was adapted from <a href="https://www.youtube.com/watch?v=6CQ7DYni7Bg" target="_blank" rel="noopener">Codegrid's excellent little Youtube video</a> from last year. You should check it out. I only made this as a test of a mobile code-sketching setup. Codepen works great on phones! So I just propped mine up in a cupholder on my bus to New York, hooked it up to a bluetooth keyboard, and sketched this and two other little things up. So fun, highly recommend it for young ones looking to get into this. You do not need a bunch of fancy stuff to learn web development.
section.parallax
  div.parallax-fg
    h3 You can actually right click and open this image in a new tab
  div.parallax-bg
    img(src="https://franknoirot.github.io/assets/img/furniture/6.jpg")
section
  h2 Now this is a story
  p All about how my life got flipped, turned upside down, and I'd like to take a minute - just sit right there - tell ya how I became the prince of a town called "Bel Air."
section.parallax
  div.parallax-fg
    h3 How is the weather?
  div.parallax-bg
    img(src="https://franknoirot.github.io/assets/img/furniture/1.jpg")
!

CSS 

              
                :root {
  font-family: 'Roboto', sans-serif;
}

h1,h2,h3,h4,h5,h6 {
  font-family: "Roboto Slab", serif;
  color: hsl(128deg, 70%, 20%);
  filter: ;
  --h-size-min: 1.4em;
  --h-w-min: 21;
  --h-w-max: 35;
  --h-w-diff: calc(var(--h-w-max) - var(--h-w-min));
  --h-size-w-min: calc(var(--h-w-min) * 1em);
  --h-factor: 1;
  
  font-size: calc(var(--h-size-min) * var(--h-factor) + .1 * (100vw - var(--h-size-w-min)) / var(--h-w-diff));
}

h1 { --h-factor: 2.25; }
h2 { --h-factor: 2; }
h3 { --h-factor: 1.75; }
h4 { --h-factor: 1.5; }
h5 { --h-factor: 1.25; }

p {
  --p-line-height-min: 1.3em;
  --p-w-max: 35;
  --p-w-min: 21;
  --p-w-diff: calc(var(--p-w-max)-var(--p-w-min));
  --p-line-height-w-min: calc(var(--p-w-min) * 1em);
  
  line-height: calc(var(--p-line-height-min) + .75 * (100vw - var(--p-line-height-w-min)) / var(--p-w-diff));
}

html {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

body {
  background: white;
  margin: 0;
  padding: 0;
  height: 100%;
  transform-style: preserve-3d;
  perspective: 1px;
  overflow-y: scroll;
  overflow-x: hidden;
}

section {
  background: white;
  box-sizing: border-box;
  padding: 5vmin 5vw;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.parallax {
  min-height: 100vh;
}

.parallax,
.parallax-fg {
  width: 100vw;
  display: flex;
  position: relative;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 5vw;
  transform-style: inherit;
  box-sizing: border-box;
  overflow: hidden;
}

.parallax,
.parallax-fg,
.parallax-bg {
  background: 50% 50% / cover;
}

.parallax-bg {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  display: block;
  background-size: cover;
  transform-origin: 50% 50% 0;
  transform: translateZ(-1px)  scale(2);
  z-index: -1;
  min-height: 100vh;
  background-color: #44884d;
}

.parallax-bg img {
  mix-blend-mode: screen;
}
!

JS 

              
                // 🤖 These are not the droids you're looking for. 🤖
!
999px

Console