fix(web-components): scope submenu fallback positioning to non-anchor browsers only #32000
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Previous Behavior
In an attempt to fix submenu fallback positioning for non-anchor-supported browsers (Safari/Firefox), I broke positioning in Edge/Chrome.
See submenu in last example in Edge/Chrome: https://web-components.fluentui.dev/?path=/docs/components-menu--menu
New Behavior
This scopes the position fallback position rule needed for older browsers into an
@supports not
rule to fix the regression in Edge/Chrome while still providing support to non-Anchor browsers.Related Issue(s)