javascript - initialise time of animation svg not to 0s -

i want declare animation svg, exemple: begin x @ 100, finish @ 300 in 10 seconds.

<animatemotion path="m100,0 l300,0" dur="10s" begin="0s" /> 

but now, want initialize start of animation x seconds (here exemple: 5sec) past. want anim realy start @ 200 , finish @ 300 in 5 seconds.

exactly setcurrenttime() does, works on svg (and so, animations). need set each animations different dynamic values.

how can initialise animation not begin x seconds past?

thx.

sounds want call beginelementat on animation element. creates begin instance time current time plus specified offset.

if want animation act if has begun pass negative number.