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
• 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
    • The only exception is if it's length==2 with [1] being a syncbase value that results in a looped animation (example). Any indexes beyond [1] will be ignored.

Current Status

Animation Elements

Element	Status
<animate>	Partial
<animateColor>	No
<animateTransform>	No
<animateMotion>	Impossible
<mpath>	Impossible
<set>	No

Animation Attributes

Attributes	Status		Timing Attributes	Status		Value Attributes	Status
attributeName	Partial		begin	Partial		accumulate	Impossible
attributeType	No		dur	Yes		additive	Impossible
type	No		end	Partial		calcMode	No
			min	No		values	Yes
			max	No		keyTimes	Yes
			restart	No		keySplines	No
			repeatCount	Yes		from	Yes
			repeatDur	No		to	Yes
			fill	No		by	No

Attributes	Status
attributeName	Partial
attributeType	No
type	No

Timing Attributes	Status
begin	Partial
dur	Yes
end	Partial
min	No
max	No
restart	No
repeatCount	Yes
repeatDur	No
fill	No

Value Attributes	Status
accumulate	Impossible
additive	Impossible
calcMode	No
values	Yes
keyTimes	Yes
keySplines	No
from	Yes
to	Yes
by	No