CSS Backgrounds and Borders Module Level 3 (CSS Backgrounds 3) Implementation Report

Introduction

This report was prepared to document the current implementation status of the CSS Backgrounds and Borders Module Level 3 (CSS Backgrounds 3) specification as of 6 July 2023 and is based on current test results available in the W3C Conformance Test Harness.

Implementations

Twelve user agents, built from seven rendering implementations, were tested across five operating systems.

• Complete list of user agents tested

Tests

The 6 July 2023 revision of the CSS Backgrounds 3 test suite was used. The test suite consists of 128 tests.

These tests are available in several host language variants:

• HTML 4
• XHTML 1.1
• XHMLT 1.1 for Printers

Some tests only apply to certain language variants; the results for each tested implementation are reported for each tested language variant. Also, not all tests are applicable to each implementation; for example, a browser which implements HTML but not XHTML is not tested for XHTML.

Results

In summary, the results show that all 128 tests were passed by at least two of the tested implementations.

Results were gathered from implementation reports submitted by user agent vendors as well as the general public via the W3C Conformance Test Harness.

• Summary table of test result counts per rendering implementation
• Detailed results for each rendering implementation
• Blink
• Edge
• Gecko
• PaleMoon
• Simple
• Trident
• WebKit