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JavaScript, DOM et API Web HTML5

Faire fonctionner un puzzle en javascript avec "chrome" et "Edge"

Bonjour,
J'ai créé des puzzles pour mon site : https://pierres-info.fr/puzzle1/index.html
Tout va bien avec Firefox, mais je me suis rendu compte qu'avec Google Chrome et Edge il y a un bug...
Cela vient apparement du fait que je centre l'image, Firfox assimile, mais Chrome ne prend pas en compte le décalage.
Je joins le code si une bonne âma veux bien me conseiller :

<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<head>
    <title>PUZZLE PIERRES-INFO</title>
    <script>
        const PUZZLE_DIFFICULTY = 4;
        const PUZZLE_HOVER_TINT = '#009900';
        var _stage;
        var _canvas;
        var _img;
        var _pieces;
        var _puzzleWidth;
        var _puzzleHeight;
        var _pieceWidth;
        var _pieceHeight;
        var _currentPiece;
        var _currentDropPiece;  
        var _mouse;
        function init(){
            _img = new Image();
            _img.addEventListener('load',onImage,false);
            _img.src = "cyclop_pierre.jpg";
        }
        function onImage(e){
            _pieceWidth = Math.floor(_img.width / PUZZLE_DIFFICULTY)
            _pieceHeight = Math.floor(_img.height / PUZZLE_DIFFICULTY)
            _puzzleWidth = _pieceWidth * PUZZLE_DIFFICULTY;
            _puzzleHeight = _pieceHeight * PUZZLE_DIFFICULTY;
            setCanvas();
            initPuzzle();
        }
        function setCanvas(){
            _canvas = document.getElementById('canvas');
            _stage = _canvas.getContext('2d');
            _canvas.width = _puzzleWidth;
            _canvas.height = _puzzleHeight;
            _canvas.style.border = "1px solid black";
        }
        function initPuzzle(){
            _pieces = [];
            _mouse = {x:0,y:0};
            _currentPiece = null;
            _currentDropPiece = null;
            _stage.drawImage(_img, 0, 0, _puzzleWidth, _puzzleHeight, 0, 0, _puzzleWidth, _puzzleHeight);
            buildPieces();
        }
        function createTitle(msg){
            _stage.fillStyle = " #fff2e6";
            _stage.globalAlpha = .5;
            _stage.fillRect(100,_puzzleHeight - 40,_puzzleWidth - 200,40);
            _stage.fillStyle = "brown";
            _stage.globalAlpha = 1;
            _stage.textAlign = "center";
            _stage.textBaseline = "middle";
            _stage.font = "35px garamond";
            _stage.fillText(msg,_puzzleWidth / 2,_puzzleHeight - 20);
        }
        function buildPieces(){
            var i;
            var piece;
            var xPos = 0;
            var yPos = 0;
            for(i = 0;i < PUZZLE_DIFFICULTY * PUZZLE_DIFFICULTY;i++){
                piece = {};
                piece.sx = xPos;
                piece.sy = yPos;
                _pieces.push(piece);
                xPos += _pieceWidth;
                if(xPos >= _puzzleWidth){
                    xPos = 0;
                    yPos += _pieceHeight;
                }
            }
            document.onmousedown = shufflePuzzle;
        }
        function shufflePuzzle(){
            _pieces = shuffleArray(_pieces);
            _stage.clearRect(0,0,_puzzleWidth,_puzzleHeight);
            var i;
            var piece;
            var xPos = 0;
            var yPos = 0;
            for(i = 0;i < _pieces.length;i++){
                piece = _pieces[i];
                piece.xPos = xPos;
                piece.yPos = yPos;
                _stage.drawImage(_img, piece.sx, piece.sy, _pieceWidth, _pieceHeight, xPos, yPos, _pieceWidth, _pieceHeight);
                _stage.strokeRect(xPos, yPos, _pieceWidth,_pieceHeight);
                xPos += _pieceWidth;
                if(xPos >= _puzzleWidth){
                    xPos = 0;
                    yPos += _pieceHeight;
                }
            }
            document.onmousedown = onPuzzleClick;
        }
        function onPuzzleClick(e){
            if(e.layerX || e.layerX == 0){
                _mouse.x = e.layerX - _canvas.offsetLeft;
                _mouse.y = e.layerY - _canvas.offsetTop;
            }
            else if(e.offsetX || e.offsetX == 0){
                _mouse.x = e.offsetX - _canvas.offsetLeft;
                _mouse.y = e.offsetY - _canvas.offsetTop;
            }
            _currentPiece = checkPieceClicked();
            if(_currentPiece != null){
                _stage.clearRect(_currentPiece.xPos,_currentPiece.yPos,_pieceWidth,_pieceHeight);
                _stage.save();
                _stage.globalAlpha = .9;
                _stage.drawImage(_img, _currentPiece.sx, _currentPiece.sy, _pieceWidth, _pieceHeight, _mouse.x - (_pieceWidth / 2), _mouse.y - (_pieceHeight / 2), _pieceWidth, _pieceHeight);
                _stage.restore();
                document.onmousemove = updatePuzzle;
                document.onmouseup = pieceDropped;
            }
        }
        function checkPieceClicked(){
            var i;
            var piece;
            for(i = 0;i < _pieces.length;i++){
                piece = _pieces[i];
                if(_mouse.x < piece.xPos || _mouse.x > (piece.xPos + _pieceWidth) || _mouse.y < piece.yPos || _mouse.y > (piece.yPos + _pieceHeight)){
                    //PIECE NOT HIT
                }
                else{
                    return piece;
                }
            }
            return null;
        }
        function updatePuzzle(e){
            _currentDropPiece = null;
            if(e.layerX || e.layerX == 0){
                _mouse.x = e.layerX - _canvas.offsetLeft;
                _mouse.y = e.layerY - _canvas.offsetTop;
            }
            else if(e.offsetX || e.offsetX == 0){
                _mouse.x = e.offsetX - _canvas.offsetLeft;
                _mouse.y = e.offsetY - _canvas.offsetTop;
            }
            _stage.clearRect(0,0,_puzzleWidth,_puzzleHeight);
            var i;
            var piece;
            for(i = 0;i < _pieces.length;i++){
                piece = _pieces[i];
                if(piece == _currentPiece){
                    continue;
                }
                _stage.drawImage(_img, piece.sx, piece.sy, _pieceWidth, _pieceHeight, piece.xPos, piece.yPos, _pieceWidth, _pieceHeight);
                _stage.strokeRect(piece.xPos, piece.yPos, _pieceWidth,_pieceHeight);
                if(_currentDropPiece == null){
                    if(_mouse.x < piece.xPos || _mouse.x > (piece.xPos + _pieceWidth) || _mouse.y < piece.yPos || _mouse.y > (piece.yPos + _pieceHeight)){
                        //NOT OVER
                    }
                    else{
                        _currentDropPiece = piece;
                        _stage.save();
                        _stage.globalAlpha = .4;
                        _stage.fillStyle = PUZZLE_HOVER_TINT;
                        _stage.fillRect(_currentDropPiece.xPos,_currentDropPiece.yPos,_pieceWidth, _pieceHeight);
                        _stage.restore();
                    }
                }
            }
            _stage.save();
            _stage.globalAlpha = .6;
            _stage.drawImage(_img, _currentPiece.sx, _currentPiece.sy, _pieceWidth, _pieceHeight, _mouse.x - (_pieceWidth / 2), _mouse.y - (_pieceHeight / 2), _pieceWidth, _pieceHeight);
            _stage.restore();
            _stage.strokeRect( _mouse.x - (_pieceWidth / 2), _mouse.y - (_pieceHeight / 2), _pieceWidth,_pieceHeight);
        }
        function pieceDropped(e){
            document.onmousemove = null;
            document.onmouseup = null;
            if(_currentDropPiece != null){
                var tmp = {xPos:_currentPiece.xPos,yPos:_currentPiece.yPos};
                _currentPiece.xPos = _currentDropPiece.xPos;
                _currentPiece.yPos = _currentDropPiece.yPos;
                _currentDropPiece.xPos = tmp.xPos;
                _currentDropPiece.yPos = tmp.yPos;
            }
            resetPuzzleAndCheckWin();
        }
        function resetPuzzleAndCheckWin(){
            _stage.clearRect(0,0,_puzzleWidth,_puzzleHeight);
            var gameWin = true;
            var i;
            var piece;
            for(i = 0;i < _pieces.length;i++){
                piece = _pieces[i];
                _stage.drawImage(_img, piece.sx, piece.sy, _pieceWidth, _pieceHeight, piece.xPos, piece.yPos, _pieceWidth, _pieceHeight);
                _stage.strokeRect(piece.xPos, piece.yPos, _pieceWidth,_pieceHeight);
                if(piece.xPos != piece.sx || piece.yPos != piece.sy){
                    gameWin = false;
                }
            }
            if(gameWin){
                setTimeout(gameOver,500);
				alert('Bon pied, bon oeil !');
}
        }
        function gameOver(){
            document.onmousedown = null;
            document.onmousemove = null;
            document.onmouseup = null;
            initPuzzle();
        }
        function shuffleArray(o){
            for(var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
            return o;
        }
    </script>
</head>
<body onload="init();"><center><font  face="garamond" color = "brown"size="5px">
Tu as un bel œil tu sais !...<br>
Entaille-moi ! !...</font><br><br>
    <canvas id="canvas" width="550" height="607"></center></canvas>
</body>
</html>

Merci pour vos bons conseils Smiley jap Smiley jap
Merci pour ton message... Effectivement, j'ai solutionné le problème en faisant une iframe centrée, elle... C'est sauvage et tordu mais ça marche.
Affaire résolue donc
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