Canvas vs SVG
Run the Canvas vs SVG MicroSim Fullscreen
About This MicroSim
This interactive simulation walks learners through four key differences between the HTML Canvas API and Scalable Vector Graphics (SVG). Each stage illustrates one dimension of the comparison — drawing model, scaling behavior, interaction capabilities, and rendering performance — using side-by-side visual panels.
Use the Next and Previous buttons below the canvas to step through the four stages. On Stage 3 (Interaction), hover your mouse over the shapes on the SVG side to see native event handling in action.
Stages
| Stage | Title | What It Shows |
|---|---|---|
| 1 | Drawing | Canvas draws pixels with no object memory; SVG creates persistent DOM nodes for each shape |
| 2 | Scaling | Canvas produces blocky artifacts when zoomed; SVG re-renders crisply at any scale |
| 3 | Interaction | Canvas requires manual hit-testing; SVG shapes respond natively to hover and click events |
| 4 | Performance | Canvas handles thousands of shapes efficiently; SVG slows down because each shape is a DOM node |
When to Use Each
| Factor | Choose Canvas | Choose SVG |
|---|---|---|
| Shape count | High (>1000 shapes, particles) | Low to moderate (<500 shapes) |
| Interactivity | Pixel-level effects, custom hit detection | Per-element events, CSS styling, accessibility |
| Scaling needs | Fixed resolution is acceptable | Must look crisp on retina and when zoomed |
| Animation style | Frame-based redrawing (games, simulations) | Declarative transitions (CSS or SMIL) |
| Accessibility | Requires extra ARIA work | DOM nodes are accessible by default |
Lesson Plan
Grade Level
Undergraduate / Professional Development
Duration
15-20 minutes
Prerequisites
Basic understanding of HTML elements and the difference between raster and vector images. Familiarity with the browser DOM is helpful but not required.
Learning Objective
Compare the Canvas and SVG rendering models by observing how each handles drawing, scaling, and interaction.
Activities
- Guided Walkthrough (8 min): Instructor projects the MicroSim and steps through all four stages. At each stage, pause and ask students to predict what will happen before revealing the behavior.
- Hands-On Exploration (5 min): Students open the MicroSim on their own devices. On Stage 3, they hover over shapes and observe the difference in interactivity. On Stage 4, they note the performance labels.
- Comparison Table (5 min): Students fill in a blank comparison table (Canvas vs SVG) using what they learned from the four stages. Compare answers with a partner.
Assessment
Students can correctly identify at least three differences between Canvas and SVG rendering and explain when each technology is the better choice for an interactive infographic project.