littlelink/app.js

// Set expanded value block to a variable
const valueBlock = document.getElementById("value-expanded");

// Watch for the details element to be toggled
document.querySelector('.value-block').addEventListener('toggle', function() {
  if (this.open) {
    // Scroll to contents of value block when it is opened
    valueBlock.scrollIntoView({ behavior: "smooth" });
  }
});