Chrome's Hidden CSS Scroll-Snap Threshold and How to Change It

css scroll-snap not working when rule is first removed then added again (chrome)

If you also remove and then add a rule for child elements, scroll-snap-align, it works ok.

I updated your fiddle: https://jsfiddle.net/gjcs3y6k/4/

How to emulate CSS Scroll Snap Points in Chrome?

Chrome 69 will contain the feature. No workaround needed.

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Just sit and wait. Just sit and wait :-)

Cannot change horizontal scroll snap into vertical scroll snap

Your parent element doesn't have a fixed height and expands to fit the children. On top of that, you also need to set overflow-y: scroll; for parent element:

// None!

/* Hide the scroll bars */

body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

.slides {
  /* We set the scroll snapping */
  scroll-snap-type: y mandatory;
  /* Necessary for mobile scrolling */
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-flow: column;
  /* hide horizontal overflow */
  overflow-x: hidden;
  /* allow vertical overflow */
  overflow-y: scroll;
  /* set the height for parent, overwise it will expand to fit children */
  height: 100vh;
}

section {
  /* For styling purposes */
  display: flex;
  min-height: 100vh;
  width: 100vw;
  align-items: center;
  justify-content: center;
  background-repeat: no-repeat;
  background-size: cover;
  /* Set where the snapping should happen */
  scroll-snap-align: start;
}

/* Styling for the sections */

section h2 {
  font-family: system-ui, sans-serif;
  font-size: 2rem;
  color: #1a1a1a;
  font-weight: 100;
}

section h3 {
  font-family: system-ui, sans-serif;
  font-size: 2rem;
  color: #ffffff;
  font-weight: 100;
}

.section-1 {
  background-image: url('https://images.unsplash.com/photo-1524260855046-f743b3cdad07?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1401&q=80')
}

.section-2 {
  background-image: url('https://images.unsplash.com/34/BA1yLjNnQCI1yisIZGEi_2013-07-16_1922_IMG_9873.jpg?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1351&q=80')
}

.section-3 {
  background-image: url('https://images.unsplash.com/photo-1500964757637-c85e8a162699?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1378&q=80')
}

.section-4 {
  background-image: url('https://images.unsplash.com/photo-1501791330673-603715379ded?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80')
}

<main class="slides">
  <section class="section-1">
    <h2>Scroll down to see it in action lt;/h2>
  </section>
  <section class="section-2">
    <h3>Woah! That's a cool effect!</h3>
  </section>
  <section class="section-3">
    <h2>And no Javascript! lt;/h2>
  </section>
  <section class="section-4">
    <h3>How cool is that?</h3>
  </section>
</main>

CSS/JavaScript - Scroll snap when user starts scrolling

The developer you were looking at is using this js script if you ant to emulate it exactly https://alvarotrigo.com/fullPage/

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