<!DOCTYPE html> <html lang="en" class="reftest-wait"> <meta charset="utf-8"> <title>Changes to background-position should not cause things to repaint that don't intersect the background image.</title> <style> body { margin: 0; } #background { height: 512px; background-image: url(image_rgrg-256x256.png); background-repeat: no-repeat; background-position: 300px 50px; } #not-intersecting-background { box-sizing: border-box; width: 200px; height: 200px; margin: 50px; border: 1px solid lime; } </style> <div id="background"> <div id="not-intersecting-background" class="reftest-no-paint"></div> </div> <script> function doTest() { document.querySelector("#background").style.backgroundPosition = "300px 100px"; document.documentElement.removeAttribute("class"); } document.addEventListener("MozReftestInvalidate", doTest); </script>