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Notice the duplicate <meta> elements in the <head> of grpc.io:
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="generator" content="Hugo 0.81.0" />
<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
<link rel="shortcut icon" href="/favicon.ico">
<link rel="apple-touch-icon" href="/favicons/apple-touch-icon.png">
<link rel="icon" type="image/png" href="/favicons/android-chrome-192x192.png" sizes="192x192">
<link rel="icon" type="image/png" href="/favicons/android-chrome-512x512.png" sizes="512x512">
<link rel="icon" type="image/png" href="/favicons/favicon-32x32.png" sizes="32x32">
<link rel="icon" type="image/png" href="/favicons/favicon-16x16.png" sizes="16x16">
<link rel="manifest" href="/favicons/site.webmanifest">
<title>gRPC</title>
<meta property="og:title" content="" />
<meta property="og:description" content="A high-performance, open source universal RPC framework" />
<meta property="og:type" content="website" />
<meta property="og:url" content="https://grpc.io/" /><meta property="og:site_name" content="gRPC" />
<meta itemprop="name" content="">
<meta itemprop="description" content="A high-performance, open source universal RPC framework"><meta name="twitter:card" content="summary"/>
<meta name="twitter:title" content=""/>
<meta name="twitter:description" content="A high-performance, open source universal RPC framework"/>
<link href="/css/style.css" rel="stylesheet">
<script>...</script>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="alternate" type="application/rss+xml" href="https://grpc.io/" title="gRPC" />
<link rel="canonical" href="https://grpc.io/">
<meta name="twitter:card" content="summary">
<meta name="twitter:site" content="@grpcio">
<meta name="twitter:creator" content="@grpcio">
<meta name="twitter:image" content="https://grpc.io/img/logos/grpc-icon-color.png">
<meta name="twitter:image:alt" content="gRPC color logo">
<meta property="og:url" content="https://grpc.io/">
<meta property="og:title" content="gRPC">
<meta property="og:description" content="A high-performance, open source universal RPC framework">
<meta property="og:type" content="website">
<meta property="og:site_name" content="gRPC">
<meta property="og:image" content="https://grpc.io/img/logos/grpc-icon-color.png">
<meta property="og:image:type" content="image/png">
<meta property="og:image:alt" content="gRPC color logo">
<meta property="og:locale" content="en_US">
<link rel="shortcut icon" href="/favicon.ico">
<link rel="apple-touch-icon" href="/favicons/apple-touch-icon.png">
<link rel="icon" type="image/png" href="/favicons/android-chrome-192x192.png" sizes="192x192">
<link rel="icon" type="image/png" href="/favicons/android-chrome-512x512.png" sizes="512x512">
<link rel="icon" type="image/png" href="/favicons/favicon-32x32.png" sizes="32x32">
<link rel="icon" type="image/png" href="/favicons/favicon-16x16.png" sizes="16x16">
<link rel="manifest" href="/favicons/site.webmanifest">
</head>