[lang|="es"], xml:lang="es" (html)
This test failed because it relies on [lang|=..] for results, but [lang|=..] is not supported by this browser.
[Exploratory test] A [lang|='es'] value that matches an identical xml:lang attribute value will NOT produce styling in pages served as HTML.
This tests a detail related to [lang|=..] support. If [lang|=..] is not supported, a message will appear and the test will fail.