js inject css code example

Example: inject css with javascript

let isScrolled = false;

window.addEventListener("scroll", () => {
  if (window.scrollY < 800) {
    let styleString1 = `body {background: silver;}`
      const style1 = document.createElement('style');
      style1.textContent = styleString1;
      document.head.append(style1);
      // console.log("style1: ", style1)
    isScrolled = false;
    console.log("not past 800px, isScrolled: ", isScrolled)
    
  } else {
    let styleString2 = `body {background: red;}`
      const style2 = document.createElement('style');
      style2.textContent = styleString2;
      document.head.append(style2);
      // console.log("style2: ", style2)
    isScrolled = true;
    console.log("past 800px, isScrolled: ", isScrolled)
  }
});

console.log("isScrolled 3", isScrolled)