File API: Match Firefox on readAsDataURL default MIME type.

pwnall · chromium-wpt-export-bot · commit 61df0b90ef19 · 2018-06-18T22:20:13.000-04:00
In Firefox, File.readAsDataURL's default MIME type is to application/octet-stream. Chrome currently leaves the MIME type out when it is unknown. While this meets all relevant specifications, matching Firefox's behavior makes the platform easier to reason about. Bug: 48368 Change-Id: If480df5cc3a1177a58c7c3dc68c57f3d6408b9eb Reviewed-on: https://chromium-review.googlesource.com/1104183 Commit-Queue: Victor Costan <pwnall@chromium.org> Reviewed-by: Marijn Kruisselbrink <mek@chromium.org> Cr-Commit-Position: refs/heads/master@{#568292}
diff --git a/FileAPI/reading-data-section/filereader_readAsDataURL.html b/FileAPI/reading-data-section/filereader_readAsDataURL.html
@@ -1,39 +1,51 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <meta charset="utf-8">
-    <title>FileAPI Test: filereader_readAsDataURL</title>
-    <link rel="author" title="Intel" href="http://www.intel.com">
-    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#readAsDataURL">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-  </head>
-  <body>
-    <div id="log"></div>
-
-    <script>
-    async_test(function() {
-      var blob = new Blob(["TEST"]);
-      var reader = new FileReader();
-
-      reader.onload = this.step_func(function(evt) {
-        assert_equals(typeof reader.result, "string", "The result is string");
-        assert_equals(reader.result.indexOf("data:"), 0, "The result attribute starts with 'data'");
-        assert_true(reader.result.indexOf("base64") > 0, "The result attribute contains 'base64'");
-        assert_equals(reader.readyState, reader.DONE);
-        this.done();
-      });
-
-      reader.onloadstart = this.step_func(function(evt) {
-        assert_equals(reader.readyState, reader.LOADING);
-      });
-
-      reader.onprogress = this.step_func(function(evt) {
-        assert_equals(reader.readyState, reader.LOADING);
-      });
-
-      reader.readAsDataURL(blob);
-    });
-    </script>
-  </body>
-</html>
+<!doctype html>
+<meta charset="utf-8">
+<title>FileAPI Test: FileReader.readAsDataURL</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="help" href="https://w3c.github.io/FileAPI/#readAsDataURL">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+async_test(function(testCase) {
+  var blob = new Blob(["TEST"]);
+  var reader = new FileReader();
+
+  reader.onload = this.step_func(function(evt) {
+    assert_equals(reader.readyState, reader.DONE);
+    testCase.done();
+  });
+  reader.onloadstart = this.step_func(function(evt) {
+    assert_equals(reader.readyState, reader.LOADING);
+  });
+  reader.onprogress = this.step_func(function(evt) {
+    assert_equals(reader.readyState, reader.LOADING);
+  });
+
+  reader.readAsDataURL(blob);
+}, 'FileReader readyState during readAsDataURL');
+
+async_test(function(testCase) {
+  var blob = new Blob(["TEST"], { type: 'text/plain' });
+  var reader = new FileReader();
+
+  reader.onload = this.step_func(function() {
+    assert_equals(reader.result, "data:text/plain;base64,VEVTVA==");
+    testCase.done();
+  });
+  reader.readAsDataURL(blob);
+}, 'readAsDataURL result for Blob with specified MIME type');
+
+async_test(function(testCase) {
+  var blob = new Blob(["TEST"]);
+  var reader = new FileReader();
+
+  reader.onload = this.step_func(function() {
+    assert_equals(reader.result,
+                  "data:application/octet-stream;base64,VEVTVA==");
+    testCase.done();
+  });
+  reader.readAsDataURL(blob);
+}, 'readAsDataURL result for Blob with unspecified MIME type');
+
+</script>
