I use HtmlUnit 2.58.0 and the corresponding HtmlUnit web driver from Geb 4.1 on top of Selenium 3.141.59.
My custom WebClient sets a SilentCssErrorHandler inside overridden modifyWebClient. I actually was expecting this to silence log lines like
13:28:11.582 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(544px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.587 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(768px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.587 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(1012px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.587 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue '0\0 ' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.597 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(544px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.599 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(768px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.599 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(1012px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.599 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue '0\0 ' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.603 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(544px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.603 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(768px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.604 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(1012px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.604 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue '0\0 ' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.607 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(544px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.607 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(768px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.607 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(1012px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.608 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue '0\0 ' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.610 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(544px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.610 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(768px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.610 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(1012px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.610 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue '0\0 ' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.616 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(544px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.616 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(768px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.617 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(1012px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.617 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue '0\0 ' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.641 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(544px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.641 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(768px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.642 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue 'calc(1012px - 0.02px)' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
13:28:11.642 [main] WARN c.g.h.j.host.css.CSSStyleSheet - CSSValue '0\0 ' has to be a 'px', 'em', '%', 'ex', 'ch', 'vw', 'vh', 'vmin', 'vmax', 'rem', 'mm', 'cm', 'Q', or 'pt' value.
in an otherwise successful test opening on https://github.com/trending, selecting the top 3 projects and opening their GH pages.
HtmlUnit / htmlunit
HtmlUnit is a "GUI-Less browser for Java programs".
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