David Baron's DOM Tests
Tests in JavaScript for compliance with some parts of the W3C DOM specs.
DOM Conformance Test Suites
W3C Document Object Model (DOM) Conformance Test Suites.
Jeremie's DOM Tests
DOM tests and examples that work in the fifth generation browsers (IE5 and Mozilla ).
NIST DOM Test Suite
Appears to be under development; currently has no usable tests.
OASIS XML Conformance Subcommittee XML 1.0 Test Su
Contains over 2000 test files and an associated test report. The test report contains background information on conformance testing for XML as well as test descriptions for each of the test files included in this release. This test suite provides a set of metrics for determining conformance to the W3C XML 1.0 (Second Edition) Recommendation.
xmlconf project on SourceForge
This project hosts XML related testing efforts, focusing initially on conformance testing.Includes a hacked version of the NIST DOM Level 1