Generated by SassMeister.com.

SassMeister-input-HTML.html

<h1>Foo</h1>
<h2>bar</h2>
<h3>foobar</h3>

<div>
<h1>Foo</h1>
<h2>bar</h2>
<h3>foobar</h3>
</div>

SassMeister-input.scss

// ----
// Sass (v3.3.2)
// Compass (v1.0.0.alpha.18)
// ----

$colors: (h1: red, h2: green);

h1{color: map-get($colors, h1);}
h2{color: map-get($colors, h2);}

$colors: map-merge($colors, (h3: blue));

h3{color: map-get($colors, h3);}

$cool-theme: (h1: pink);
$theme: $cool-theme;

div h1{color: map-get($theme, h1);}

SassMeister-output.css

h1 {
  color: red;
}

h2 {
  color: green;
}

h3 {
  color: blue;
}

div h1 {
  color: pink;
}

SassMeister-rendered.html

<h1>Foo</h1>
<h2>bar</h2>
<h3>foobar</h3>

<div>
<h1>Foo</h1>
<h2>bar</h2>
<h3>foobar</h3>
</div>