I Checked this in 2.41 and 2.42, I did not go back any farther. The parser does not accept correct calc expressions. Space after an operator is not accepted, although the spec says it has to be there. Parentheses are not expected but the spec defines them. I also tried a nested calc function in lieu of parentheses and that is rejected as well but defined in the spec. See section 11.1 for all of this.
I am not going to post the whole file. The CSS snippet has line numbers to match the warnings:
40: min-height: calc(100vh - 150px + 10px + 21px + 20pt);
366: left: calc((100vw - 600px) / 2);
367: top: calc((100vh - 100px) / 2);
2020-07-25 18:44:43.716 WARN 7545 --- [pool-3-thread-1] c.g.htmlunit.DefaultCssErrorHandler : CSS error: 'http://localhost:57928/tccc/style/application.css' [40:29] Error in expression. (Invalid token " ". Was expecting one of: , "inherit", , , , , , , <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <RESOLUTION_DPI>, <RESOLUTION_DPCM>, , , <UNICODE_RANGE>, , , "progid:".)
2020-07-25 18:44:43.719 WARN 7545 --- [pool-3-thread-1] c.g.htmlunit.DefaultCssErrorHandler : CSS error: 'http://localhost:57928/tccc/style/application.css' [366:16] Error in expression. (Invalid token "(". Was expecting one of: , , "inherit", , , ")", "-", , , , , , <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <RESOLUTION_DPI>, <RESOLUTION_DPCM>, , , <UNICODE_RANGE>, , , "progid:".)
2020-07-25 18:44:43.720 WARN 7545 --- [pool-3-thread-1] c.g.htmlunit.DefaultCssErrorHandler : CSS error: 'http://localhost:57928/tccc/style/application.css' [367:15] Error in expression. (Invalid token "(". Was expecting one of: , , "inherit", , , ")", "-", , , , , , <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <RESOLUTION_DPI>, <RESOLUTION_DPCM>, , , <UNICODE_RANGE>, , , "progid:".)
I Checked this in 2.41 and 2.42, I did not go back any farther. The parser does not accept correct calc expressions. Space after an operator is not accepted, although the spec says it has to be there. Parentheses are not expected but the spec defines them. I also tried a nested calc function in lieu of parentheses and that is rejected as well but defined in the spec. See section 11.1 for all of this.
I am not going to post the whole file. The CSS snippet has line numbers to match the warnings:
40: min-height: calc(100vh - 150px + 10px + 21px + 20pt);
366: left: calc((100vw - 600px) / 2);
367: top: calc((100vh - 100px) / 2);
2020-07-25 18:44:43.716 WARN 7545 --- [pool-3-thread-1] c.g.htmlunit.DefaultCssErrorHandler : CSS error: 'http://localhost:57928/tccc/style/application.css' [40:29] Error in expression. (Invalid token " ". Was expecting one of: , "inherit", , , , , , , <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <RESOLUTION_DPI>, <RESOLUTION_DPCM>, , , <UNICODE_RANGE>, , , "progid:".)
2020-07-25 18:44:43.719 WARN 7545 --- [pool-3-thread-1] c.g.htmlunit.DefaultCssErrorHandler : CSS error: 'http://localhost:57928/tccc/style/application.css' [366:16] Error in expression. (Invalid token "(". Was expecting one of:
, , "inherit", , , ")", "-", , , , , , <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <RESOLUTION_DPI>, <RESOLUTION_DPCM>, , , <UNICODE_RANGE>, , , "progid:".)2020-07-25 18:44:43.720 WARN 7545 --- [pool-3-thread-1] c.g.htmlunit.DefaultCssErrorHandler : CSS error: 'http://localhost:57928/tccc/style/application.css' [367:15] Error in expression. (Invalid token "(". Was expecting one of:
, , "inherit", , , ")", "-", , , , , , <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <RESOLUTION_DPI>, <RESOLUTION_DPCM>, , , <UNICODE_RANGE>, , , "progid:".)