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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/contextlost_event below:

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("contextlost", (event) => { })

oncontextlost = (event) => { }

A generic Event.

The code fragment below detects the contextlost event.

const canvas = document.getElementById("canvas");

canvas.addEventListener("contextlost", (event) => {
  console.log(event);
});

To prevent the context from being restored the code might instead look like this:

const canvas = document.getElementById("canvas");

canvas.addEventListener("contextlost", (event) => {
  event.preventDefault();
});

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