CSS Pseudo-Elements Module Level 4 (CSS Pseudo-Elements 4) Implementation Report

Introduction

This report was prepared to document the current implementation status of the CSS Pseudo-Elements Module Level 4 (CSS Pseudo-Elements 4) specification as of 6 July 2023 and is based on current test results available in the W3C Conformance Test Harness.

Implementations

Eleven user agents, built from eight rendering implementations, were tested across five operating systems.

Tests

The 6 July 2023 revision of the CSS Pseudo-Elements 4 test suite was used. The test suite consists of 165 tests, 9 of which test for optional behavior.

These tests are available in several host language variants:

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 112 of 156 tests for required behavior were passed by at least two of the tested implementations. In addition, 2 of 9 tests for optional behavior 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.