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[soft-navigations] Take paint area into account
Currently, it's possible for a soft navigation to be triggered after a non-visual element was appended to the DOM. This CL modifies that, so that only if visual elements that comprise of at least 20% of the initial (hard navigation) paint area were appended to the DOM as a result of a user interaction, that would count as a soft navigation. Bug: 1479355 Change-Id: Id4609c6435c2ab3dde1a26fea14988e7cd171dad Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4846835 Reviewed-by: Ian Clelland <iclelland@chromium.org> Commit-Queue: Yoav Weiss <yoavweiss@chromium.org> Cr-Commit-Position: refs/heads/main@{#1207615}
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70 changes: 70 additions & 0 deletions
70
soft-navigation-heuristics/softnav-after-lcp-paint-larger-than-viewport.tentative.html
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| <!DOCTYPE HTML> | ||
| <html> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <script src="/resources/testharness.js"></script> | ||
| <script src="/resources/testharnessreport.js"></script> | ||
| <script src="/resources/testdriver.js"></script> | ||
| <script src="/resources/testdriver-vendor.js"></script> | ||
| <script src="/soft-navigation-heuristics/resources/soft-navigation-helper.js"></script> | ||
| <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> | ||
| </head> | ||
| <body> | ||
| <main id=main> | ||
| <div> | ||
| <a id=link><img id="initial_image1" src="/images/lcp-256x256.png?1" style="width: 90vw; height: 90vh"> | ||
| <div id=extra></div> | ||
| </a> | ||
| </div> | ||
| </main> | ||
| <script> | ||
| (async () => { | ||
| const link = document.getElementById("link"); | ||
|
|
||
| // Inject a second image that takes a large part of the viewport. | ||
| await new Promise(resolve => { | ||
| requestAnimationFrame(() => requestAnimationFrame(() => { | ||
| document.getElementById("extra").innerHTML = ` | ||
| <div style="position: absolute; bottom: 0; right: 0"> | ||
| <img id="initial_image2" src="/images/lcp-256x256.png?2" style="width: 90vw;height: 90vh"> | ||
| </div>`; | ||
| resolve(); | ||
| })); | ||
| }); | ||
| // Wait until the second image is rendered. | ||
| await new Promise(resolve => { | ||
| requestAnimationFrame(() => requestAnimationFrame(() => { | ||
| resolve(); | ||
| })); | ||
| }); | ||
| testSoftNavigation({ | ||
| addContent: async () => { | ||
| // Remove the initial image, so that the text would be painted on screen. | ||
| document.getElementById("initial_image1").remove(); | ||
| document.getElementById("initial_image2").remove(); | ||
| let lcp_element_painted; | ||
| const lcp_element_paint_promise = new Promise((r) => { lcp_element_painted = r; }); | ||
| // Add an LCP element, but have it be small enough to not trigger the | ||
| // Soft Navigation heuristics. | ||
| const p = addTextParagraphToMain( | ||
| "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod", | ||
| /*element_timing=*/"lcp"); | ||
| (new PerformanceObserver(list => { | ||
| // Once the first element is fully painted: | ||
| lcp_element_painted(); | ||
| })).observe({type: "element", buffered: true}); | ||
| await lcp_element_paint_promise; | ||
| // Add a smaller element that gets us over that threshold. | ||
| addTextParagraphToMain("dolore magna aliqua."); | ||
| }, | ||
| link: link, | ||
| test: "Test that an image LCP followed by a smaller soft navigation LCP" | ||
| + " properly queues an LCP entry, even when the soft navigation is" | ||
| + " detected after the LCP, even when initial paints significantly" | ||
| + " exceed the viewport dimensions."}); | ||
| })(); | ||
| </script> | ||
| </body> | ||
| </html> | ||
|
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|
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42 changes: 42 additions & 0 deletions
42
soft-navigation-heuristics/softnav-after-lcp-paint.tentative.html
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| <!DOCTYPE HTML> | ||
| <html> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <title>Detect simple soft navigation.</title> | ||
| <script src="/resources/testharness.js"></script> | ||
| <script src="/resources/testharnessreport.js"></script> | ||
| <script src="/resources/testdriver.js"></script> | ||
| <script src="/resources/testdriver-vendor.js"></script> | ||
| <script src="resources/soft-navigation-helper.js"></script> | ||
| <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> | ||
| </head> | ||
| <body> | ||
| <main id=main> | ||
| <div> | ||
| <a id=link><img src="/images/lcp-256x256.png"></a> | ||
| </div> | ||
| </main> | ||
| <script> | ||
| const link = document.getElementById("link"); | ||
| testSoftNavigation({ | ||
| addContent: async () => { | ||
| let lcp_element_painted; | ||
| const lcp_element_paint_promise = new Promise((r) => { lcp_element_painted = r; }); | ||
| // Add an LCP element, but have it be small enough to not trigger the | ||
| // Soft Navigation heuristics. | ||
| const p = addTextParagraphToMain("Lorem Ipsu", /*element_timing=*/"lcp"); | ||
| (new PerformanceObserver(list => { | ||
| // Once the first element is fully painted: | ||
| lcp_element_painted(); | ||
| })).observe({type: "element", buffered: true}); | ||
| await lcp_element_paint_promise; | ||
| // Add a smaller element that gets us over that threshold. | ||
| addTextParagraphToMain("m"); | ||
| }, | ||
| link: link, | ||
| test: "Test that an image LCP followed by a smaller soft navigation LCP" | ||
| + " properly queues an LCP entry, even when the soft navigation is" | ||
| + " detected after the LCP."}); | ||
| </script> | ||
| </body> | ||
| </html> |
52 changes: 52 additions & 0 deletions
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soft-navigation-heuristics/softnav-before-lcp-paint.tentative.html
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| <!DOCTYPE HTML> | ||
| <html> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <title>Detect simple soft navigation.</title> | ||
| <script src="/resources/testharness.js"></script> | ||
| <script src="/resources/testharnessreport.js"></script> | ||
| <script src="/resources/testdriver.js"></script> | ||
| <script src="/resources/testdriver-vendor.js"></script> | ||
| <script src="resources/soft-navigation-helper.js"></script> | ||
| <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> | ||
| </head> | ||
| <body> | ||
| <main id=main> | ||
| <div> | ||
| <a id=link><img src="/images/lcp-256x256.png"></a> | ||
| </div> | ||
| </main> | ||
| <script> | ||
| const link = document.getElementById("link"); | ||
| testSoftNavigation({ | ||
| addContent: async () => { | ||
| // Add an LCP element, large enough to trigger the Soft Navigation | ||
| // heuristics. | ||
| const p = addTextParagraphToMain("Lorem Ipsum", /*element_timing=*/"lcp"); | ||
| p.id = "first_lcp"; | ||
| // Once the first element is fully painted. | ||
| const observer = new PerformanceObserver(list => { | ||
| // Add a larger element to be the new LCP. | ||
| window.lcp_observer_promise = new Promise(resolve => { | ||
| (new PerformanceObserver(resolve)).observe({type: "element"}); | ||
| }); | ||
| const p2 = addTextParagraphToMain("LOREM IPSUMER", "real_lcp"); | ||
| p2.id = "real_lcp"; | ||
| observer.disconnect(); | ||
| }); | ||
| observer.observe({type: "element", buffered: true}); | ||
| }, | ||
| link: link, | ||
| validate: async () => { | ||
| await window.lcp_observer_promise; | ||
| const lcps = await getLcpEntries(); | ||
| assert_greater_than_equal(lcps.length, 3, "Got at least 3 LCP entries"); | ||
| assert_equals(lcps[lcps.length - 2].id, "first_lcp", "Got the first LCP"); | ||
| assert_equals(lcps[lcps.length - 1].id, "real_lcp", "Got the real LCP"); | ||
| }, | ||
| test: "Test that an image LCP followed by 2 smaller soft navigation LCPs" | ||
| + " properly queues both LCP entries, even when the soft navigation" | ||
| + " is detected in between them."}); | ||
| </script> | ||
| </body> | ||
| </html> |
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