Based on the data analysis, books.zkoss.org underwent 4 accessibility tests in the 1 742 days that followed September 26, 2021. 1 times books.zkoss.org was accessible from total checks attempted, with the latest uptime on September 26, 2021, returning a 200 code. The checks carried out as of July 4, 2026, did not identify any downtime issues related to books.zkoss.org. The latest error response out of the 3 that encountered errors was code 403, recorded on April 13, 2026. Contrasting with an average of 0.940 seconds, books.zkoss.org showed a response time of 0.336 seconds on April 13, 2026.