SMIL on? | CSS-Tricks
Briefly

The discussion on SVG animations highlights uncertainty regarding SMIL (Synchronized Multimedia Integration Language) support. Initially viewed as declining, especially with limited support in WebKit and Microsoft browsers, there’s a mixed view on its viability. Chrome's intentions to deprecate SMIL haven't yet materialized into action. While CSS and JavaScript alternatives are favored, recent reports suggest that SMIL isn't completely obsolete. The adoption of the Chromium engine by Microsoft's Edge shows that SMIL may still have potential for use in animations, offering a glimmer of hope for its future.
"Unfortunately, support for SMIL is waning in WebKit, and has never (nor will likely ever) exist for Microsoft's IE or Edge browsers."
"Chrome was also in on the party and published an intent to deprecate SMIL, citing work in other browsers to support SVG animations in CSS."
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