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diff --git a/ext/pitch-accents-preview.html b/ext/pitch-accents-preview.html
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--- a/ext/pitch-accents-preview.html
+++ /dev/null
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-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width,initial-scale=1">
-    <title>Yomichan Pitch Accents Preview</title>
-    <link rel="icon" type="image/png" href="/images/icon16.png" sizes="16x16">
-    <link rel="icon" type="image/png" href="/images/icon19.png" sizes="19x19">
-    <link rel="icon" type="image/png" href="/images/icon32.png" sizes="32x32">
-    <link rel="icon" type="image/png" href="/images/icon38.png" sizes="38x38">
-    <link rel="icon" type="image/png" href="/images/icon48.png" sizes="48x48">
-    <link rel="icon" type="image/png" href="/images/icon64.png" sizes="64x64">
-    <link rel="icon" type="image/png" href="/images/icon128.png" sizes="128x128">
-    <link rel="stylesheet" type="text/css" href="/css/display-pronunciation.css">
-    <link rel="stylesheet" type="text/css" href="/css/pitch-accents-preview.css">
-</head>
-<body>
-
-<div class="content"><div class="content-body">
-
-<ul>
-    <li>
-        <strong>Downstep notation</strong> -
-        <span class="format-preview" lang="ja">
-            <span class="pitch-accent-characters"><span class="pitch-accent-character" data-position="0" data-pitch="high" data-pitch-next="low"><span class="pitch-accent-character-inner">よ</span></span><span class="pitch-accent-character" data-position="1" data-pitch="low" data-pitch-next="low"><span class="pitch-accent-character-inner">む</span></span></span>
-        </span>
-    </li>
-    <li>
-        <strong>Downstep position</strong> -
-        <span class="format-preview">
-            <span class="pitch-accent-position">1</span>
-        </span>
-    </li>
-    <li>
-        <strong>Graph</strong> -
-        <span class="format-preview">
-            <span class="pitch-accent-details">
-                <svg xmlns="http://www.w3.org/2000/svg" class="pitch-accent-graph" focusable="false" viewBox="0 0 150 100">
-                    <path class="pitch-accent-graph-line" d="M25 25 L75 75"></path>
-                    <path class="pitch-accent-graph-line-tail" d="M75 75 L125 75"></path>
-                    <circle class="pitch-accent-graph-dot-downstep1" cx="25" cy="25" r="15"></circle>
-                    <circle class="pitch-accent-graph-dot-downstep2" cx="25" cy="25" r="5"></circle>
-                    <circle class="pitch-accent-graph-dot" cx="75" cy="75" r="15"></circle>
-                    <path class="pitch-accent-graph-triangle" d="M0 13 L15 -13 L-15 -13 Z" transform="translate(125,75)"></path>
-                </svg>
-            </span>
-        </span>
-    </li>
-</ul>
-
-</div></div>
-
-</body>
-</html>