1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
<!DOCTYPE HTML>
<html>
<head>
<meta name="viewport" content="width=device-width,minimum-scale=1">
<title>Test soft navigation UKM collection</title>
<script src="resources/util.js"></script>
</head>
<body>
<style>
#shifter {
position: relative;
width: 300px;
height: 200px;
background: blue;
}
</style>
<div id="shifter">shifter</div>
<main id=main>
<div>
<a id=link><img src="/images/lcp-256x256.png"></a>
</div>
</main>
<div id="div">content</div>
<script>
const addImage = async (element) => {
const img = new Image();
img.src = '/images/lcp-133x106.png' + "?" + Math.random();
await img.decode();
element.appendChild(img);
};
const addImageToMain = async () => {
await addImage(document.body);
};
const waitOnPaintEntriesPromise = () => {
return new Promise((resolve, reject) => {
if (!performance.softNavPaintMetricsSupported) {
// If we don't have paint entries, fall back to a timer instead.
setTimeout(resolve, 200);
}
const paint_entries = []
new PerformanceObserver(list => {
paint_entries.push(...list.getEntries());
if (paint_entries.length == 2) {
resolve();
} else if (paint_entries.length > 2) {
reject();
}
}).observe({ type: 'paint', includeSoftNavigationObservations: true });
});
};
const waitForRegularLcpEntries = () => {
return new Promise(resolve => {
new PerformanceObserver(resolve).observe(
{
type: 'largest-contentful-paint', buffered: true
});
})
}
const waitForSoftNavigationLcpEntries = () => {
return new Promise(resolve => {
new PerformanceObserver(resolve).observe(
{
type: 'largest-contentful-paint', buffered: true,
includeSoftNavigationObservations: true
});
})
}
const GetSoftNavigationLCPEntries = async () => {
const soft_nav_entry_navigation_ids = await new Promise(resolve => {
(new PerformanceObserver(list => {
if (list.getEntries().length >= 2) {
resolve(list.getEntries().map(e => e.navigationId));
}
})).observe({
type: 'soft-navigation', buffered: true
});
});
const soft_nav_lcp_entries = await new Promise(resolve => {
(new PerformanceObserver(list => {
let soft_nav_entries = list.getEntries().filter(
e => soft_nav_entry_navigation_ids.includes(e.navigationId));
if (soft_nav_entries.length >= 2) {
resolve(soft_nav_entries);
}
})).observe({
type: 'largest-contentful-paint', buffered: true,
includeSoftNavigationObservations: true
});
});
return soft_nav_lcp_entries.map(e => JSON.stringify(e.toJSON()));
}
let counter = 0;
const setEvent = (button, pushState, addContent, pushUrl, eventType) => {
const URL = "foobar.html";
button.addEventListener(eventType, async e => {
// Jump through a task, to ensure task tracking is working properly.
await new Promise(r => setTimeout(r, 0));
const url = URL + "?" + counter;
if (pushState) {
if (pushUrl) {
pushState(url);
} else {
pushState();
}
}
await new Promise(r => setTimeout(r, 10));
await addContent(url);
++counter;
});
};
const setEventAndWait = async () => {
await waitForRegularLcpEntries();
const link = document.getElementById("link");
setEvent(link, /*pushState=*/url => history.pushState({}, '', url),
/*addContent=*/async () => await addImageToMain(), /*pushUrl=*/true,
/*eventType=*/"click");
}
const waitForSoftNavigationEntry = async () => {
if (!PerformanceObserver.supportedEntryTypes.includes('soft-navigation')) {
throw new Error("Soft Navigations API not supported");
}
await new Promise(resolve => {
(new PerformanceObserver(resolve)).observe({
type: 'soft-navigation', buffered: true
});
});
await waitOnPaintEntriesPromise();;
await waitForSoftNavigationLcpEntries();
}
const waitForSoftNavigationEntry2 = async () => {
await new Promise(resolve => {
(new PerformanceObserver(() => resolve())).observe({
type: 'soft-navigation'
});
});
await waitOnPaintEntriesPromise();
await waitForSoftNavigationLcpEntries();
}
let eventPromises = [];
const registerEventListeners = () => {
eventPromises = [];
const element = document.getElementById('div');
for (const event of ['mouseup', 'pointerup', 'click']) {
eventPromises.push(new Promise(resolve => {
element.addEventListener(event, resolve, { once: true });
}));
}
}
const waitForClick = async () => {
await Promise.all(eventPromises);
}
const addChangeColorEventListener = () => {
const element = document.getElementById('div');
element.addEventListener("pointerdown", () => {
element.style = "color:red";
});
}
if (PerformanceObserver.supportedEntryTypes.indexOf("layout-shift") == -1)
throw new Error("Layout Instability API not supported");
// An list to record all the entries with startTime and score.
let element = document.querySelector("#shifter");
(async () => {
await waitUntilAfterNextLayout();
document.querySelector("#shifter").style = "top: 160px";
})();
const triggerLayoutShift = async (multiplier = 1) => {
// Wait for 50 milliseconds that the click simulation that caused the
// soft navigation would not be counted as recent input.
await new Promise(resolve => setTimeout(resolve, 500));
let element = document.querySelector("#shifter")
let val = parseInt(getComputedStyle(element).top, 10);
element.style.top = (val + 40) * multiplier + "px";
}
const GetLayoutShift = async (expected_soft_nav_count = 0) => {
let soft_nav_entry_navigation_id;
if (expected_soft_nav_count > 0) {
soft_nav_entry_navigation_id = await new Promise(resolve => {
const observer = new PerformanceObserver(list => {
let soft_nav_entries = list.getEntries();
if (soft_nav_entries.length >= expected_soft_nav_count) {
observer.disconnect();
resolve(list.getEntries()[soft_nav_entries.length - 1].navigationId);
}
});
observer.observe({
type: 'soft-navigation', buffered: true
});
});
}
return await new Promise((resolve) => {
const layout_shifts = [];
const observer = new PerformanceObserver((list) => {
for (const entry of list.getEntries()) {
layout_shifts.push(entry);
}
if (expected_soft_nav_count > 0) {
let soft_nav_layout_shifts = layout_shifts.filter(
e => soft_nav_entry_navigation_id == e.navigationId);
if (soft_nav_layout_shifts.length >= 1) {
observer.disconnect();
resolve(soft_nav_layout_shifts.map((entry) => ({
startTime: entry.startTime,
score: entry.value,
hadRecentInput: entry.hadRecentInput,
})));
}
} else {
if (layout_shifts.length >= 1) {
observer.disconnect();
resolve(layout_shifts.map((entry) => ({
startTime: entry.startTime,
score: entry.value,
hadRecentInput: entry.hadRecentInput,
})));
}
}
});
observer.observe({
type: 'layout-shift', buffered: true
});
});
}
</script>
</body>
</html>
|
