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              <div class="guide-content">
  <section style="height: 110vh;">
    <header>
      <h2>Scroll Down &#8597;</h2>
    </header>
  </section>
  <section>
    <header>
      <h2>Animating Variable Font Headlines</h2>
    </header>
  </section>
</div>
            
          
!
            
              h2 {
	font-family: "Variable Bahnschrift", "FF DIN", "Franklin Gothic", "Helvetica Neue", sans-serif;
	font-feature-settings: "kern" 1;
	line-height: 1.2;
	text-transform: uppercase;
	letter-spacing: .05em;
	color: #424f5e;
  font-size: 2.25em;
  opacity: .8;
	font-weight: 100;

	/* TranslateZ sends el to its own rendering layer */
	transform: scale(.8) translateZ(1px);
	transition: font-weight 1s, opacity 1s, transform 1s;
  text-align: center;
  margin-bottom: 500px;
}

h2.in-view {
	opacity: .99;
	font-weight: 900;
	transform: scale(1) translateZ(1px);
}
            
          
!
            
              	// ANIMATE FONT-WEIGHT ON HEADINGS WHEN THEY ARE IN VIEW
	const animateHeader = function(guideHeader, ratio) {
		if (ratio > 0) {
			if (false && guideHeader.tagName === 'H2') {
					guideHeader.classList.add('in-view');
			} else {
				guideHeader.classList.add('in-view');
			}
		} else {
			guideHeader.classList.remove('in-view');
		}
	};

  // Setup the Intersection observer to watch the boxes we care about
  // and when they're in view fire the animation function to add our
  // CSS classes
	const guideHeaders = document.querySelectorAll('.guide-content h2');
	const guideHeadersObserver = new IntersectionObserver((entries) => {
		return entries.forEach((e) => {
			animateHeader(e.target, e.intersectionRatio);
		});
	}, { threshold: 0.1 });
	for (const guideHeader of guideHeaders) {
		guideHeadersObserver.observe(guideHeader);
		guideHeadersObserver.observe(guideHeader.closest('section'));
	}
            
          
!
999px
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