Writing HTML | Return to Lesson 27a |

Testing HTML for Lesson 27a

• Some browsers will display the message immediately as an alert message
• For Internet Explorer 6, you must enable the display of script errors:
  1. Select Internet Options from the Tools menu.
  2. Click the Advanced tab.
  3. Check the box under "Browsing" that reads Display a notication about every script error
  4. Click Apply and then Okay
• In NetScape or Mozilla you may have to bring up a JavaScript Console window by going to the URL javascript:
• Other browsers (Safari) may not generate an error message at all, but the page may not work correctly.

If you view the source of this web page, you will see the following JavaScript code that has a mistake in it (you will learn more about this command in the next lesson, but trust us- it has a mistake!):

<script type="text/javascript" language="Javascript">
<!--
document.write('<p>This shows what happens in a document.write statement
if it has an extraneous RETURN that breaks the commans in half');
//-->
</script>

Note that if you receive an error message it indicates the type of error, the line number of the HTML where the error occurs, and the location in the line where it found the error. Note that one error in a JavaScript code section can trigger many others that follow it, so fixing the first error may take care of others error messages displayed.

Also, note that the error prevents the button from following its instructions.