font canvas HTML . Regular . , . normal lighter, . . w3schools :
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "normal 30px Arial";
ctx.fillText("Hello World", 20, 50);
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
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