Canvas's default width = 300px and height = 150px, it has no default border, but we can add border just like CSS.
Draw a single line using canvas :
Add jquery library :
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
Declare canvas in HTML body :
<canvas id="exampleCanvas" width="500" height="300" style="border:1px solid #000;"></canvas>
JQuery Code :
var context = $("#exampleCanvas")[0].getContext("2d");
context.beginPath();
context.moveTo(50, 50);
context.lineTo(250, 150);
context.stroke();
Output :