<!DOCTYPE html>
<html>
    <head>
        <title>measureText directionality</title>
        <meta charset="utf-8">
        <style>
            canvas { background: green; }
        </style>
    </head>
    <body>
        <h1>measureText directionality</h1>
        <canvas id="canvas" width="150" height="150"></canvas>
        <p>
            There should be a green box above with no red.
        </p>
        <script>
            var text = '\u200D\u0628';
            var canvas = document.getElementById('canvas');
            var context = canvas.getContext('2d');
            context.font = '48pt Times New Roman';
            context.fillStyle= 'red';
            context.fillText(text, 50, 100);
            var width = context.measureText(text).width + 4;
            context.fillStyle = 'green';
            context.fillRect(50, 1, width, 148);
        </script>
    </body>
</html>