On https://github.com/mozilla/pdf.js/wiki/Required-Browser-Features we mention required browser features for PDF.js, but I have the feeling that not all of them are necessary nowadays since we moved to using more modern features over the years. Moreover, as indicated in https://github.com/mozilla/pdf.js/issues/11950#issuecomment-637149085, some features may be missing such as range requests or `async/await`.

In short, we should verify which are still necessary and update the wiki page and the automated feature detection if possible.
gulp.task(
  "fonttest",
  gulp.series("testing-pre", function () {
    return createTestSource("font");
  })
);
gulp.task(
  "makeref",
  gulp.series("testing-pre", "generic", "components", function (done) {
    makeRef(done);
  })
);
gulp.task(
  "botmakeref",
  gulp.series("testing-pre", "generic", "components", function (done) {
    makeRef(done, true);
  })
);
gulp.task(
  "typestest-pre",
  gulp.series("testing-pre", "generic", "types", function () {
    const [packageJsonSrc] = packageBowerJson();
    return merge([
      packageJsonSrc.pipe(gulp.dest(TYPESTEST_DIR)),
      gulp
        .src([
          GENERIC_DIR + "build/pdf.js",
          GENERIC_DIR + "build/pdf.worker.js",
          SRC_DIR + "pdf.worker.entry.js",
        ])