Rectangle using Perl
The code:
use strict;
use warnings;
use SVG (-nocredits => 1, -inline => 1);
my $svg= SVG->new( width => 200, height => 200);
$svg->rectangle(
x => 10,
y => 20,
width => 180,
height => 120,
rx => 10,
ry => 30,
fill => "#3a83c5",
);
print $svg->xmlify();
The generated SVG
<svg height="200" width="200" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<rect fill="#3a83c5" height="120" rx="10" ry="30" width="180" x="10" y="20" />
</svg>
The image: