Limitations

CSS is not compatible with some SMIL features. Most incompatibilities will throw an error, preventing useless output. However, it's possible that some may have been undetected, so be sure to check the output file in a browser.

Below is a list of unsupported SMIL features.

Most common:

• Motion path elements: <animateMotion>,<mpath>.
• Unmatching repeatCount and begin per element. read more
• Reptitions that do not start at 0s. read more
• Exact repeats. It either plays once or it plays forever.

Less common:

• Animation event attributes: onbegin,onend,onload,onrepeat.
• Additive and cumulative behaviors.
• Specific time values:
  • accessKey, event, repeat and wallclock-sync, time values.
  • Any of these time values except Metric.
  • Syncbase values (with two exceptions). read more
  • lists