@tylergaw RE: https://tylergaw.com/blog/view-transition-at-rule/
Technically speaking the switch from the meta tag to the at-rule opt-in is not a breaking change because the meta tag (which was always described as a temporary thing) never shipped to stable.
It is expected from experimental features that they will change over time, until we (as in: the CSSWG) settle on a syntax that is acceptable to all vendors and is one that meets developer’s needs.
@tylergaw As for the `chrome://flags#view-transition` flag no longer being availble: because Same-Document View Transitions have shipped to stable a long time ago, the feature flag is no longer relevant and was therefore removed. You can expect the `chrome://flags#view-transition-on-navigation` flag to also disappear over time, as engineering cleans up code that is no longer necessary.