diff --git a/javascript/atoms/test/window_size_test.html b/javascript/atoms/test/window_size_test.html
index 8c9c6acd1a199..2b85a1ff5b9d6 100644
--- a/javascript/atoms/test/window_size_test.html
+++ b/javascript/atoms/test/window_size_test.html
@@ -69,8 +69,21 @@
         return;
       }
       var size = new goog.math.Size(350, 450);
+      var done = assert.async();
+      var start = new Date().getTime();
       bot.window.setSize(size);
-      verifySize(assert, size);
+      var isIE = bot.userAgent.IE_DOC_9 || bot.userAgent.IE_DOC_PRE9;
+      (function poll() {
+        var actual = bot.window.getSize();
+        if (isIE ||
+            (actual.width === size.width && actual.height === size.height) ||
+            new Date().getTime() - start > 2000) {
+          verifySize(assert, size);
+          done();
+          return;
+        }
+        window.setTimeout(poll, 50);
+      })();
     });
 
     QUnit.test('setSizeUsingGetSize', function(assert) {
diff --git a/javascript/selenium-webdriver/test/lib/webdriver_script_test.js b/javascript/selenium-webdriver/test/lib/webdriver_script_test.js
index f1e4c632f1ad1..a1d260ae32e18 100644
--- a/javascript/selenium-webdriver/test/lib/webdriver_script_test.js
+++ b/javascript/selenium-webdriver/test/lib/webdriver_script_test.js
@@ -36,6 +36,14 @@ suite(
     })
 
     describe('script()', function () {
+      async function waitForLogEntry(getLogEntry, message) {
+        await driver.wait(() => getLogEntry() != null, 5000, message)
+      }
+
+      async function waitForLogText(logs, text) {
+        await driver.wait(() => logs.includes(text), 5000, `Timed out waiting for console log "${text}"`)
+      }
+
       it('can listen to console log', async function () {
         let log = null
         const handler = await driver.script().addConsoleMessageHandler((logEntry) => {
@@ -44,6 +52,7 @@ suite(
 
         await driver.get(Pages.logEntryAdded)
         await driver.findElement({ id: 'consoleLog' }).click()
+        await waitForLogEntry(() => log, 'Timed out waiting for console log entry')
 
         assert.equal(log.text, 'Hello, world!')
         assert.equal(log.realm, null)
@@ -62,6 +71,7 @@ suite(
 
         await driver.get(Pages.logEntryAdded)
         await driver.findElement({ id: 'jsException' }).click()
+        await waitForLogEntry(() => log, 'Timed out waiting for JavaScript error log entry')
 
         assert.equal(log.text, 'Error: Not working')
         assert.equal(log.type, 'javascript')
@@ -91,6 +101,7 @@ suite(
         await element.click()
         let revealed = driver.findElement({ id: 'revealed' })
         await driver.wait(until.elementIsVisible(revealed), 5000)
+        await waitForLogEntry(() => message, 'Timed out waiting for DOM mutation')
 
         assert.strictEqual(message['attribute_name'], 'style')
         assert.strictEqual(message['current_value'], '')
@@ -124,6 +135,7 @@ suite(
         })
 
         await driver.get(Pages.logEntryAdded)
+        await waitForLogEntry(() => log, 'Timed out waiting for pinned script log entry')
 
         assert.equal(log.text, 'Hello!')
       })
@@ -138,6 +150,8 @@ suite(
         })
 
         await driver.get(Pages.logEntryAdded)
+        await waitForLogText(logs, 'Hello')
+        await waitForLogText(logs, 'World')
         assert.ok(logs.includes('Hello'), `[${logs}] should contain "Hello"`)
         assert.ok(logs.includes('World'), `[${logs}] should contain "World"`)
 
@@ -145,6 +159,7 @@ suite(
 
         logs.length = 0
         await driver.get(Pages.logEntryAdded)
+        await waitForLogText(logs, 'World')
         assert.ok(logs.includes('World'), `[${logs}] should contain "World"`)
         assert.ok(!logs.includes('Hello'), `[${logs}] should not contain "Hello"`)
       })