When i tried this code, it didn't work context.rect(50,50,100,50); context.stroke();

Answer 1

You may get more help if you post the code or link to the tutorial you're referencing.

Answer 2

Your code is incomplete. You need the <canvas> tag
And a script for the code.

HTML

<canvas id="canvas"></canvas>

JS

const canvas = document.getElementById("canvas");
const context = canvas.getContext("2d");
context.rect(50, 50, 100, 50);
context.stroke();