SourceBuffer: abort event

addEventListener("abort", (event) => { })
onabort = (event) => { }

const sourceBuffer = source.addSourceBuffer(mimeCodec);
sourceBuffer.addEventListener("abort", () => {
  downloadStatus.textContent = "Canceled";
});
sourceBuffer.addEventListener("update", () => {
  downloadStatus.textContent = "Done";
});
sourceBuffer.addEventListener("updateend", () => {
  source.endOfStream();
});
cancelButton.addEventListener("click", () => {
  if (sourceBuffer.updating) {
    sourceBuffer.abort();
  }
});
downloadStatus.textContent = "Downloading...";
fetch(assetURL)
  .then((response) => response.arrayBuffer())
  .then((data) => {
    downloadStatus.textContent = "Decoding...";
    sourceBuffer.appendBuffer(data);
  });