Hi! I heard in a lightning talk from the Kotlin Co...
# webassemblyj
jean
10/23/2025, 9:07 PMHi! I heard in a lightning talk from the Kotlin Conf 2025 that Compose Multiplatform on Web (with Wasm) is rendered on Canvas. How does that work? Are there any resources diving into rendering? I have a bunch of questions like
• Does it write ui updates as bytes into a shared memory and the web browser reads from it as a stream and sends that to the canvas?
• Does it calculate/render the compose tree and send that over the browser where it converts it as UI?
c
Chrimaeon
10/23/2025, 9:21 PMIt’s using skiko to draw to an
<canvas>Chrimaeon
10/23/2025, 9:26 PMCheck out the web samples https://zal.im/wasm/iv and see that the whole website is just one canvas element.
There is also #C01F2HV7868 where you might get better answers to questions like this.
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a
AndrewStone
10/30/2025, 9:22 PMIts not canvas anymore. I think it used to be, and there's a deprecated API that you can still use to render into a canvas. This is completely done in compose, and you can see its all shown as DOM in the browser.
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Chrimaeon
10/30/2025, 9:49 PMThat’s compose HTML and not Compose web. They are 2 different things. Compose HTML is not multiplatform.
https://github.com/JetBrains/compose-multiplatform
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