<?xml version="1.0" standalone="no"?>

    
<svg style='border:1px solid black' width='480' height='450' version='1.1'  xmlns='http://www.w3.org/2000/svg'>
<svg width='426' height='426' viewBox='-25, -25, 426, 426' version='1.1'  xmlns='http://www.w3.org/2000/svg'>
   <pattern id='pattern-halfgrid' x='0' y='0' width='5' height='5' patternUnits='userSpaceOnUse'>
       <path d='M 5 0 L 0 0 0 5' fill='none' stroke='red' stroke-width='0.2'/>
   </pattern>
   <pattern id='pattern-grid' x='0' y='0' width='10' height='10' patternUnits='userSpaceOnUse'>
       <rect width='10' height='10' fill='url(#pattern-halfgrid)' stroke-width='0'></rect>
       <path d='M 10 0 L 0 0 0 10' fill='none' stroke='black' stroke-width='0.2'/>
   </pattern>
   <rect x='0' y='0' width='100%' height='100%' fill='url(#pattern-grid)' stroke-width='0'></rect>
  
   <svg transform='scale(0.938967136150235)' preserveAspectRatio='xMinYMin' viewBox='0 0 10 10' xmlns='http://www.w3.org/2000/svg'>
       <rect width='10' height='10'>
           <animate attributeName='rx' values='0;5;0' dur='10s' repeatCount='indefinite' />
       </rect>
   </svg>
  </svg>
<text x='5' y='17' font-size='20'>(0,0)</text>
<text x='395' y='17' font-size='20'>(10,0)</text>
<text x='5' y='445' font-size='20'>(0,10)</text>
<text x='395' y='445' font-size='20'>(10,10)</text>
<circle cx='25' cy='25' r='2' fill='black'/>
<circle cx='425' cy='25' r='2' fill='black'/>
<circle cx='25' cy='425' r='2' fill='black'/>
<circle cx='425' cy='425' r='2' fill='black'/>
</svg>