« QA/Firefox3.1/TestPlan

Feature Script Defer Test Plan

Overview

Script defer is a feature that has been in IE and other browsers for years since the HTML 4 spec. Basically this is an attribute for the <script> tag where we can defer loading one or more scripts so the page content will load without waiting for large or cross-domain scripts.

Test Strategy

• defer loading of script and verify page loads
• queuing of local scripts
  • queue 2 scripts, other still loads
  • queue a script that references other scripts

• accessing variables / functions from deferred script
  • have inline script call function in deferred script
  • have inline script update variable in deferred script

There are a lot of corner cases such as testing all javascript functionality in both normal and defer. One such bug came up where window.onload() would not call [bug 453801]

Schedule Scoping

• Landed in September
• Available in 3.1
• Many test cases included in bug
• Estimate 1 full day to develop and execute test cases

References

• [bug 28293]
• [WHATWG spec]