| <!DOCTYPE html> |
| <!-- |
| | This test checks that the root margin is being parsed and factored in |
| | appropriately. |
| | The target element is initially transparent, but if the intersection ratio is |
| | computed correctly it turns opaque (becomes visibly green). |
| | https://www.w3.org/TR/intersection-observer/ |
| --> |
| <html> |
| <head> |
| <style> |
| div { |
| position: absolute; |
| } |
| #root { |
| background-color: red; |
| width: 250px; |
| height: 150px; |
| } |
| #target { |
| background-color: rgba(0, 128, 0, 0); |
| width: 150px; |
| height: 250px; |
| margin: 50px 150px; |
| } |
| </style> |
| </head> |
| <body> |
| <div id="root"> |
| <div id="target"></div> |
| </div> |
| |
| <script> |
| if (window.testRunner) { |
| window.testRunner.waitUntilDone(); |
| } |
| |
| window.addEventListener("load", function() { |
| var rootElement = document.querySelector('#root'); |
| var targetElement = document.querySelector('#target'); |
| var expectedRatio = 0.2816; |
| var epsilon = 0.00001; |
| |
| function handleIntersect(entries, observer) { |
| entries.forEach(function(entry) { |
| console.log(entry); |
| if (Math.abs(entry.intersectionRatio - expectedRatio) < epsilon) { |
| entry.target.style.backgroundColor = "rgba(0, 128, 0, 255)"; |
| } |
| }); |
| } |
| |
| function createObserver() { |
| var options = { |
| root: rootElement, |
| rootMargin: "40px -5% 20px", |
| threshold: 0.0 |
| }; |
| |
| var observer = new IntersectionObserver(handleIntersect, options); |
| observer.observe(targetElement); |
| } |
| |
| createObserver(); |
| |
| if (window.testRunner) { |
| window.testRunner.DoNonMeasuredLayout(); |
| window.setTimeout(function() { window.testRunner.notifyDone(); }, 0); |
| } |
| }); |
| </script> |
| |
| </body> |
| </html> |
