javascript - How to convert svg element height/width size into pixels -

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i have svg elements , want height , width in terms of pixels. how this?

<rect height="200" width="400" fill="red" stroke="1">

measurements in vector formats relative size 'window' or 'viewer' going rendered in. without knowing viewports size in pixels, infinitely large or small. if have viweports size , element isnt being transformed anything, you'd need see element in relation viewport, ensure displayed, , calculate rendered size. however, beware if being clipped out of diplay being partially or 'off screen'.


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