Enable the accessibility audit for chrome://net-internals

chrome/test/data/webui/net_internals/net_internals_test.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview The way these tests work is as follows:
  * C++ in net_internals_ui_browsertest.cc does any necessary setup, and then
  * calls the entry point for a test with RunJavascriptTest.  The called
  * function can then use the assert/expect functions defined in test_api.js.
  * All callbacks from the browser are wrapped in such a way that they can
@@ skipping 38 matching lines @@
      */
     typedefCppFixture: 'NetInternalsTest',
 
     /** @inheritDoc */
     browsePreload: 'chrome://net-internals/',
 
     /** @inheritDoc */
     isAsync: true,
 
     setUp: function() {
+      // Enforce accessibility auditing, but suppress some false positives.
+      this.accessibilityIssuesAreErrors = true;
+      // False positive because a unicode character is used to draw a square.
+      // If it was actual text it'd be too low-contrast, but a square is fine.
+      this.accessibilityAuditConfig().ignoreSelectors(
+          'lowContrastElements', '#timeline-view-selection-ul label');
+      // Suppress this error; the black-on-gray button is readable.
+      this.accessibilityAuditConfig().ignoreSelectors(
+          'lowContrastElements', '#export-view-save-log-file');
+      // False positive because the background color highlights and then
+      // fades out with a transition when there's an error.
+      this.accessibilityAuditConfig().ignoreSelectors(
+          'lowContrastElements', '#hsts-view-query-output span');
+      // False positives for unknown reason.
+      this.accessibilityAuditConfig().ignoreSelectors(
+          'focusableElementNotVisibleAndNotAriaHidden',
+          '#hsts-view-tab-content *');
+
       // Wrap g_browser.receive around a test function so that assert and expect
       // functions can be called from observers.
       g_browser.receive =
           this.continueTest(WhenTestDone.EXPECT,
                             BrowserBridge.prototype.receive.bind(g_browser));
 
       g_browser.setPollInterval(TESTING_POLL_INTERVAL_MS);
 
       var runTest = this.deferRunTest(WhenTestDone.EXPECT);
 
@@ skipping 635 matching lines @@
     ];
 
     for (var i = 0; i < allIds.length; ++i) {
       var curId = allIds[i];
       expectEquals(nodeId == curId, NetInternalsTest.nodeIsVisible($(curId)));
     }
   };
 
   return NetInternalsTest;
 })();