Test link(s): [test](https://w3c.github.io/i18n-tests/exploratory/vanilla/index.html?text=%3Cstyle%3E.propernoun%20%7B%20text-decoration-line%3Aunderline%3B%20text-decoration-skip-inset%3A%20auto%3B%20%7D%20.title%20%7B%20text-decoration-line%3Aunderline%3B%20text-decoration-style%3A%20wavy%3B%20text-decoration-skip-inset%3A%20auto%3B%20%7D%3C%2Fstyle%3E%0A%3Cbdi%20class%3D%22propernoun%22%3E%E5%AE%8B%3C%2Fbdi%3E%3Cbdi%20class%3D%22propernoun%22%3E%E6%AD%90%E9%99%BD%E4%BF%AE%3C%2Fbdi%3E%3Cbdi%20class%3D%22title%22%3E%E6%98%8E%E5%A6%83%E6%9B%B2%3C%2Fbdi%3E%0A&lang=zh&fontSize=50&width=500&height=500&a=text-decoration-skip-inset%3A%20auto%3B%20will%20create%20a%20gap%20between%20spans%20that%20are%20side%20by%20side%20and%20underlined%20using%20text-decoration-line%3Aunderline.&i=Test%20passes%20if%20there%20is%20a%20small%20gap%20in%20the%20underline%20between%20the%202nd%20and%203rd%20characters%20and%20the%204th%20and%205th%20characters.) Results: - **Gecko:** ❌ *Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0* - **Blink:** ❌ *Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36* - **Webkit:** ❌ *Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15* Related tests: [Text decoration](https://www.w3.org/International/i18n-tests/results/int-text-decoration.html)