Blitz - WPT: transformed-element-scroll-transform.html

wpt / css / css-view-transitions / transformed-element-scroll-transform.html

/css/css-view-transitions/transformed-element-scroll-transform.html

<!DOCTYPE html>
<html style="reftest-wait">
<head>
    <title>Scroll position transform should be the last one to be applied</title>
    <link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
    <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
    <link rel="match" href="transformed-element-scroll-transform-ref.html">
    <style>
        :root {
            view-transition-name: none;
        }

        ::view-transition-group(*) {
            animation-duration: 10s;
        }

        #target {
            width: 100px;
            height: 100px;
            background: green;
            margin: 300px;
            view-transition-name: target;
            rotate: 90deg;
        }
    </style>
</head>
<body>
    <div id="target"></div>
    <div style="height: 1000px"></div>
    <script>
        function scrollBy(y) {
            return new Promise(resolve => {
                addEventListener("scroll", () => {
                    requestAnimationFrame(() => {
                        requestAnimationFrame(resolve);
                    });
                }, { once: true, capture: true });
                document.documentElement.scrollBy({
                    top: y,
                    behavior: "instant"
                });
            });
        }
        addEventListener("load", async () => {
            await scrollBy(200);
            const transition = document.startViewTransition();
            await transition.ready;
            requestAnimationFrame(() => {
                requestAnimationFrame(() => {
                    document.documentElement.classList.remove("reftest-wait");
                });
            });
        });
    </script>
</body>
</html>

/css/css-view-transitions/transformed-element-scroll-transform-ref.html

<!DOCTYPE html>
<html style="reftest-wait">
<head>
    <style>
        #target {
            width: 100px;
            height: 100px;
            background: green;
            margin: 300px;
        }
    </style>
</head>
<body>
    <div id="target"></div>
    <div style="height: 1000px"></div>
    <script>
        function scrollBy(y) {
            return new Promise(resolve => {
                addEventListener("scroll", () => {
                    requestAnimationFrame(() => {
                        requestAnimationFrame(resolve);
                    });
                }, { once: true, capture: true });
                document.documentElement.scrollBy({
                    top: y,
                    behavior: "instant"
                });
            });
        }
        addEventListener("load", async () => {
            await scrollBy(200);
            document.documentElement.classList.remove("reftest-wait");
        });
    </script>
</body>
</html>