Canvas — Complete Guide
Canvas — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of HTML Tutorial on Toolliyo Academy.
On this page
HTML Tutorial · Lesson 15 of 100
Canvas
Basics → Forms & semantics → APIs & performance → Projects
Basics · 1 — Structure & media · ~6 min · HTML — Media & Content
What is this?
canvas is a bitmap drawing surface scripted with JavaScript (charts, games, signatures).
Why should you care?
MarkupVerse signature pads and simple chart previews use canvas with a fallback text node.
See it live — copy this example
Save as demo.html and open in your browser, or use Run Example below.
<canvas id="sig" width="400" height="150" aria-label="Signature pad">
Drawing not supported — type your name in the field below.
</canvas>
<input type="text" name="typedName" placeholder="Type full name">Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- Provide fallback content inside canvas.
- Set width/height attributes (not only CSS) for coordinate space.
Practice next
- Add canvas with id.
- Set width/height attrs.
- Add fallback text.
- Draw a line with getContext("2d") in a script.
- Export toDataURL later.
Remember
Bitmap surface. JS draws. Fallback + label.
MarkupVerse signature pad
Onboarding captures a signature.
Outcome: Canvas labeled; typed name fallback exists.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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