<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS Fonts Module Level 4: parsing font-optical-sizing with valid values</title> <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#propdef-font-optical-sizing"> <meta name="assert" content="font-optical-sizing supports the full grammar 'auto | none'."> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/css/support/parsing-testcommon.js"></script> </head> <body> <script> test_valid_value('font-optical-sizing', 'auto'); test_valid_value('font-optical-sizing', 'none'); </script> </body> </html>