auto is not even a valid value.

Created attachment 359295 [details] Patch

There will be failures...

Comment on attachment 359295 [details] Patch Attachment 359295 [details] did not pass mac-ews (mac): Output: https://webkit-queues.webkit.org/results/10775474 Number of test failures exceeded the failure limit.

Created attachment 359299 [details] Archive of layout-test-results from ews103 for mac-highsierra The attached test failures were seen while running run-webkit-tests on the mac-ews. Bot: ews103 Port: mac-highsierra Platform: Mac OS X 10.13.6

Comment on attachment 359295 [details] Patch Attachment 359295 [details] did not pass mac-wk2-ews (mac-wk2): Output: https://webkit-queues.webkit.org/results/10775471 Number of test failures exceeded the failure limit.

Created attachment 359301 [details] Archive of layout-test-results from ews104 for mac-highsierra-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: ews104 Port: mac-highsierra-wk2 Platform: Mac OS X 10.13.6

Comment on attachment 359295 [details] Patch Attachment 359295 [details] did not pass mac-debug-ews (mac): Output: https://webkit-queues.webkit.org/results/10775274 Number of test failures exceeded the failure limit.

Created attachment 359302 [details] Archive of layout-test-results from ews115 for mac-highsierra The attached test failures were seen while running run-webkit-tests on the mac-debug-ews. Bot: ews115 Port: mac-highsierra Platform: Mac OS X 10.13.6

Comment on attachment 359295 [details] Patch Attachment 359295 [details] did not pass ios-sim-ews (ios-simulator-wk2): Output: https://webkit-queues.webkit.org/results/10775535 Number of test failures exceeded the failure limit.

Created attachment 359310 [details] Archive of layout-test-results from ews121 for ios-simulator-wk2 The attached test failures were seen while running run-webkit-tests on the ios-sim-ews. Bot: ews121 Port: ios-simulator-wk2 Platform: Mac OS X 10.13.6

Comment on attachment 359295 [details] Patch Attachment 359295 [details] did not pass win-ews (win): Output: https://webkit-queues.webkit.org/results/10776626 New failing tests: css3/flexbox/flex-factor-less-than-one.html css3/flexbox/csswg/flexbox_flex-0-1-0.html fast/css/auto-min-size.html css3/flexbox/intrinsic-width-orthogonal-writing-mode.html css3/flexbox/minimum-size-image.html css3/flexbox/csswg/flexbox_flex-0-0-0.html css3/flexbox/text-overflow-on-flexbox.html css3/flexbox/min-size-auto.html fast/flexbox/auto-height-with-flex.html css3/flexbox/csswg/flexbox_flex-0-N-0.html imported/blink/css3/flexbox/text-overflow-on-flexbox.html

Created attachment 359327 [details] Archive of layout-test-results from ews201 for win-future The attached test failures were seen while running run-webkit-tests on the win-ews. Bot: ews201 Port: win-future Platform: CYGWIN_NT-6.1-2.10.0-0.325-5-3-x86_64-64bit

Actually according to https://www.w3.org/TR/css-sizing-3/#propdef-min-width the min-width initial value is auto. How does that work with block formatting context!?

'auto' For min-width/min-height, specifies an automatic minimum size. Unless otherwise defined by the relevant layout module, however, it resolves to a used value of 0.