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diff --git a/ext/js/display/sandbox/pronunciation-generator.js b/ext/js/display/sandbox/pronunciation-generator.js
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+++ b/ext/js/display/sandbox/pronunciation-generator.js
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+/*
+ * Copyright (C) 2021  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+class PronunciationGenerator {
+    constructor(japaneseUtil) {
+        this._japaneseUtil = japaneseUtil;
+    }
+
+    createPronunciationText(morae, downstepPosition, nasalPositions, devoicePositions) {
+        const jp = this._japaneseUtil;
+        const nasalPositionsSet = nasalPositions.length > 0 ? new Set(nasalPositions) : null;
+        const devoicePositionsSet = devoicePositions.length > 0 ? new Set(devoicePositions) : null;
+        const container = document.createElement('span');
+        container.className = 'pronunciation-text';
+        for (let i = 0, ii = morae.length; i < ii; ++i) {
+            const i1 = i + 1;
+            const mora = morae[i];
+            const highPitch = jp.isMoraPitchHigh(i, downstepPosition);
+            const highPitchNext = jp.isMoraPitchHigh(i1, downstepPosition);
+            const nasal = nasalPositionsSet !== null && nasalPositionsSet.has(i1);
+            const devoice = devoicePositionsSet !== null && devoicePositionsSet.has(i1);
+
+            const n1 = document.createElement('span');
+            n1.className = 'pronunciation-mora';
+            n1.dataset.position = `${i}`;
+            n1.dataset.pitch = highPitch ? 'high' : 'low';
+            n1.dataset.pitchNext = highPitchNext ? 'high' : 'low';
+
+            const characterNodes = [];
+            for (const character of mora) {
+                const n2 = document.createElement('span');
+                n2.className = 'pronunciation-character';
+                n2.textContent = character;
+                n1.appendChild(n2);
+                characterNodes.push(n2);
+            }
+
+            if (devoice) {
+                n1.dataset.devoice = 'true';
+                const n3 = document.createElement('span');
+                n3.className = 'pronunciation-devoice-indicator';
+                n1.appendChild(n3);
+            }
+            if (nasal && characterNodes.length > 0) {
+                n1.dataset.nasal = 'true';
+
+                const group = document.createElement('span');
+                group.className = 'pronunciation-character-group';
+
+                const n2 = characterNodes[0];
+                const character = n2.textContent;
+
+                const characterInfo = jp.getKanaDiacriticInfo(character);
+                if (characterInfo !== null) {
+                    n1.dataset.originalText = mora;
+                    n2.dataset.originalText = character;
+                    n2.textContent = characterInfo.character;
+                }
+
+                let n3 = document.createElement('span');
+                n3.className = 'pronunciation-nasal-diacritic';
+                n3.textContent = '\u309a'; // Combining handakuten
+                group.appendChild(n3);
+
+                n3 = document.createElement('span');
+                n3.className = 'pronunciation-nasal-indicator';
+                group.appendChild(n3);
+
+                n2.parentNode.replaceChild(group, n2);
+                group.insertBefore(n2, group.firstChild);
+            }
+
+            const line = document.createElement('span');
+            line.className = 'pronunciation-mora-line';
+            n1.appendChild(line);
+
+            container.appendChild(n1);
+        }
+        return container;
+    }
+
+    createPronunciationGraph(morae, downstepPosition) {
+        const jp = this._japaneseUtil;
+        const ii = morae.length;
+
+        const svgns = 'http://www.w3.org/2000/svg';
+        const svg = document.createElementNS(svgns, 'svg');
+        svg.setAttribute('xmlns', svgns);
+        svg.setAttribute('class', 'pronunciation-graph');
+        svg.setAttribute('focusable', 'false');
+        svg.setAttribute('viewBox', `0 0 ${50 * (ii + 1)} 100`);
+
+        if (ii <= 0) { return svg; }
+
+        const path1 = document.createElementNS(svgns, 'path');
+        svg.appendChild(path1);
+
+        const path2 = document.createElementNS(svgns, 'path');
+        svg.appendChild(path2);
+
+        const pathPoints = [];
+        for (let i = 0; i < ii; ++i) {
+            const highPitch = jp.isMoraPitchHigh(i, downstepPosition);
+            const highPitchNext = jp.isMoraPitchHigh(i + 1, downstepPosition);
+            const x = i * 50 + 25;
+            const y = highPitch ? 25 : 75;
+            if (highPitch && !highPitchNext) {
+                this._addGraphDotDownstep(svg, svgns, x, y);
+            } else {
+                this._addGraphDot(svg, svgns, x, y);
+            }
+            pathPoints.push(`${x} ${y}`);
+        }
+
+        path1.setAttribute('class', 'pronunciation-graph-line');
+        path1.setAttribute('d', `M${pathPoints.join(' L')}`);
+
+        pathPoints.splice(0, ii - 1);
+        {
+            const highPitch = jp.isMoraPitchHigh(ii, downstepPosition);
+            const x = ii * 50 + 25;
+            const y = highPitch ? 25 : 75;
+            this._addGraphTriangle(svg, svgns, x, y);
+            pathPoints.push(`${x} ${y}`);
+        }
+
+        path2.setAttribute('class', 'pronunciation-graph-line-tail');
+        path2.setAttribute('d', `M${pathPoints.join(' L')}`);
+
+        return svg;
+    }
+
+    createPronunciationDownstepNotation(downstepPosition) {
+        downstepPosition = `${downstepPosition}`;
+
+        const n1 = document.createElement('span');
+        n1.className = 'pronunciation-downstep-notation';
+        n1.dataset.downstepPosition = downstepPosition;
+
+        let n2 = document.createElement('span');
+        n2.className = 'pronunciation-downstep-notation-prefix';
+        n2.textContent = '[';
+        n1.appendChild(n2);
+
+        n2 = document.createElement('span');
+        n2.className = 'pronunciation-downstep-notation-number';
+        n2.textContent = downstepPosition;
+        n1.appendChild(n2);
+
+        n2 = document.createElement('span');
+        n2.className = 'pronunciation-downstep-notation-suffix';
+        n2.textContent = ']';
+        n1.appendChild(n2);
+
+        return n1;
+    }
+
+    // Private
+
+    _addGraphDot(container, svgns, x, y) {
+        container.appendChild(this._createGraphCircle(svgns, 'pronunciation-graph-dot', x, y, '15'));
+    }
+
+    _addGraphDotDownstep(container, svgns, x, y) {
+        container.appendChild(this._createGraphCircle(svgns, 'pronunciation-graph-dot-downstep1', x, y, '15'));
+        container.appendChild(this._createGraphCircle(svgns, 'pronunciation-graph-dot-downstep2', x, y, '5'));
+    }
+
+    _addGraphTriangle(container, svgns, x, y) {
+        const node = document.createElementNS(svgns, 'path');
+        node.setAttribute('class', 'pronunciation-graph-triangle');
+        node.setAttribute('d', 'M0 13 L15 -13 L-15 -13 Z');
+        node.setAttribute('transform', `translate(${x},${y})`);
+        container.appendChild(node);
+    }
+
+    _createGraphCircle(svgns, className, x, y, radius) {
+        const node = document.createElementNS(svgns, 'circle');
+        node.setAttribute('class', className);
+        node.setAttribute('cx', `${x}`);
+        node.setAttribute('cy', `${y}`);
+        node.setAttribute('r', radius);
+        return node;
+    }
+}