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menu_book Course Curriculum (Web Graphics) expand_more
SVG Essentials
SVG viewBox SVG rect SVG circle SVG path SVG groups SVG text SVG gradients SVG clipPath
SVG Interaction
SVG currentColor SVG CSS classes SVG accessible title SVG pointer events SVG transform SVG symbol and use SVG mask SVG filters
Canvas Drawing
Canvas 2D context Canvas rectangles Canvas paths Canvas arcs Canvas text Canvas gradients Canvas image drawing Canvas transforms
Animation & Performance
requestAnimationFrame Delta-time animation Canvas clearing Device pixel ratio Offscreen canvas Sprite-sheet drawing Hit testing Responsive SVG sizing
Web Graphics / Animation & Performance

Offscreen canvas

Learn Offscreen canvas in Web Graphics with a focused explanation, a topic-specific example, and a mastery check.

12 min read • Intermediate
web-graphics-029.html
html 
<script>const off=new OffscreenCanvas(200,100);const x=off.getContext("2d");x.fillStyle="purple";x.fillRect(0,0,200,100);console.log(off.width,off.height);</script>
What to watch
Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Offscreen canvas Mastery Check →
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Sprite-sheet drawing