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CSS+HTML, 56+84=140 bytes 52+84=136 bytes

Saved 4 bytes by incorporating suggestions from the comments.

td{border:1px solid#888;line-height:.4;font-size:3em

<table cellspacing=0><tr><td><td>•<td><tr><td><td><td>•<tr><td>•<td>•<td>•

This uses the UTF-8 character • which is 2 bytes long and takes advantage of the graciousness of HTML syntax.

Mathematica, 62 bytes

Grid[{{,a=██,},{,,a},{a,a,a}},Frame->All,FrameStyle->Gray]

Mathematica, 71 bytes

Grid[{{,l=Graphics@Disk[],},{,,l},{l,l,l}},Frame->All,FrameStyle->Gray]

GLSL (fragment shader), 278 235 256 bytes

precision highp float;void main(){vec2 a=gl_FragCoord.xy/20.-.2;ivec2 b=ivec2(a);a-=vec2(b)+.5;if(b.x>2||b.y>2)discard;gl_FragColor=a.x<-.5||a.y<-.5||a.x>.3||a.y>.3?vec4(.5,.5,.5,1.):length(a+.1)<.4&&(b.x+b.y-3)*b.y==0?vec4(0.,0.,0.,1.):vec4(1.,1.,1.,1.);}

See it in action: http://glslsandbox.com/e#40717.2