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cwv.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Core Web Vitals Charts</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-annotation"></script>
<style>
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 20px;
background-color: #f4f4f9;
}
h1 {
text-align: center;
margin-bottom: 20px;
}
.chart-container {
width: 90%;
max-width: 800px;
margin: 20px auto;
}
.chart-title {
text-align: center;
font-size: 1.2rem;
margin: 10px 0;
}
</style>
</head>
<body>
<h1>Core Web Vitals Progression</h1>
<div class="chart-container">
<div class="chart-title">Largest Contentful Paint (LCP)</div>
<canvas id="lcpChart"></canvas>
</div>
<div class="chart-container">
<div class="chart-title">First Input Delay (FID)</div>
<canvas id="fidChart"></canvas>
</div>
<div class="chart-container">
<div class="chart-title">Cumulative Layout Shift (CLS)</div>
<canvas id="clsChart"></canvas>
</div>
<script>
const ranges = {
lcp: [
{ yMin: 0, yMax: 2500, backgroundColor: 'rgba(0, 255, 0, 0.1)', label: 'Good ≤ 2.5s' },
{ yMin: 2500, yMax: 4000, backgroundColor: 'rgba(255, 255, 0, 0.1)', label: 'Needs Improvement' },
{ yMin: 4000, yMax: Infinity, backgroundColor: 'rgba(255, 0, 0, 0.1)', label: 'Poor > 4.0s' }
],
fid: [
{ yMin: 0, yMax: 100, backgroundColor: 'rgba(0, 255, 0, 0.1)', label: 'Good ≤ 100ms' },
{ yMin: 100, yMax: 300, backgroundColor: 'rgba(255, 255, 0, 0.1)', label: 'Needs Improvement' },
{ yMin: 300, yMax: Infinity, backgroundColor: 'rgba(255, 0, 0, 0.1)', label: 'Poor > 300ms' }
],
cls: [
{ yMin: 0, yMax: 0.1, backgroundColor: 'rgba(0, 255, 0, 0.1)', label: 'Good ≤ 0.1' },
{ yMin: 0.1, yMax: 0.25, backgroundColor: 'rgba(255, 255, 0, 0.1)', label: 'Needs Improvement' },
{ yMin: 0.25, yMax: Infinity, backgroundColor: 'rgba(255, 0, 0, 0.1)', label: 'Poor > 0.25' }
]
};
async function fetchData() {
const response = await fetch('./web-vitals-history.json');
return await response.json();
}
async function initializeCharts() {
const data = await fetchData();
const labels = data.map(entry => {
const date = new Date(entry.date);
return date.toLocaleDateString() + ' ' + date.toLocaleTimeString();
});
const lcpData = data.map(entry => entry.metrics.lcp || null);
const fidData = data.map(entry => entry.metrics.fid || null);
const clsData = data.map(entry => entry.metrics.cls !== null ? entry.metrics.cls : 0);
createChart(
document.getElementById('lcpChart').getContext('2d'),
'LCP (ms)',
lcpData,
'rgba(0, 123, 255, 1)',
ranges.lcp,
data
);
createChart(
document.getElementById('fidChart').getContext('2d'),
'FID (ms)',
fidData,
'rgba(40, 167, 69, 1)',
ranges.fid,
data
);
createChart(
document.getElementById('clsChart').getContext('2d'),
'CLS',
clsData,
'rgba(255, 193, 7, 1)',
ranges.cls,
data
);
}
function createChart(ctx, label, data, color, ranges, hoverData) {
new Chart(ctx, {
type: 'line',
data: {
labels: hoverData.map(entry => {
const date = new Date(entry.date);
return `${date.toLocaleDateString()} ${date.toLocaleTimeString()}`;
}),
datasets: [{
label: label,
data: data,
borderColor: color,
backgroundColor: color.replace('1)', '0.2)'),
fill: true,
tension: 0.2
}]
},
options: {
responsive: true,
scales: {
x: { title: { display: true, text: 'Date & Time' } },
y: { title: { display: true, text: label }, beginAtZero: true }
},
plugins: {
legend: { display: false },
tooltip: {
callbacks: {
label: function (context) {
const index = context.dataIndex;
const entry = hoverData[index];
return [
`PR #${entry.pr.number}: ${entry.pr.title}`,
`Date: ${new Date(entry.date).toLocaleString()}`,
`${label}: ${context.raw}`
];
}
},
backgroundColor: color,
titleFont: { size: 16 },
bodyFont: { size: 14 },
bodySpacing: 10,
padding: 15
},
annotation: {
annotations: ranges.map(({ yMin, yMax, backgroundColor, label }) => ({
type: 'box',
yMin: yMin,
yMax: yMax,
backgroundColor: backgroundColor,
borderWidth: 0,
label: {
content: label,
enabled: true,
position: 'center',
backgroundColor: 'rgba(0, 0, 0, 0.7)',
color: '#fff',
font: { size: 10 }
}
}))
}
}
}
});
}
initializeCharts();
</script>
</body>
</html>