viewbox and length,width

hi,
i'm new to svg
what is the difference between viewBox,length,width attributes in svg tag.
view box includes the width and height.so why different height,weight attributes
regards,
abacus

Hi abaccus

width and height attributes determine the physical width and height(visible area) of the drawing,
wereas the width and height specified b viewBox determine the width and height of the user-coordinate system.

<svg width="100px" height="100px" viewBox="0 0 200 200">
<rect x="0" y="0" width="100" height="100"/>
</svg>

with this you say that one user-coordinate unit is 0.5px.so the rect will have a dimension
of 50px X 50px.

here is a second example:

<svg width="2in" height="2in" viewBox="0 0 100 100">
<rect x="0" y="0" width="50" height="50"/>
</svg>

one user-coordinate unit is now 1/50 in.so the rect will have a dimension
of 1in X 1 in.

this is extremly useful for paths since there is no way to specify units for a path.
path coordinates are allwas in user-coordinate units.

hope it helps
have fun
Holger