Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.9)
// Compass (v1.0.1)
// ----

@mixin font($fontstack) {
  $segoe: (
    light: "wf_segoe-ui_light",
    normal: "wf_segoe-ui_normal",
    semibold: "wf_segoe-ui_semibold",
    bold: "wf_segoe-ui_bold"
  );
  
  $leelawadee: (
		light: 'wf_leelawadee_normal',
		normal: 'wf_leelawadee_normal',
		semibold: 'wf_leelawadee_bold',
		bold: 'wf_leelawadee_bold'
	);

	$fallback: (
		light: normal,
		normal: normal,
		semibold: bold,
		bold: bold
	);

  $fallback: (
    light: normal, 
    normal: normal, 
    semibold: bold, 
    bold: bold
  );

  font-family: map-get($segoe, $fontstack), Segoe UI, Tahoma, Arial, sans-serif;

    html:lang(bg) &,
    html:lang(cs) &,
    html:lang(el) &,
    html:lang(ko) &,
    html:lang(lt) &,
    html:lang(pl) &,
    html:lang(ro) &
    html:lang(ru) &,
    html:lang(vi) & {
      font-family: Tahoma, Arial, sans-serif;
      font-weight: map-get($fallback, $fontstack);
  }

  html:lang(zh) & { // China
		font-family: 'YaHei UI', 'Microsoft yahei', 微软雅黑, map-get($segoe, $fontstack), Tahoma, Arial, sans-serif;
		font-weight: map-get($fallback, $fontstack);
	}

	html:lang(ja) & { // Japan
		font-family: 'Meiryo', メイリオ, map-get($segoe, $fontstack), Tahoma, Arial, sans-serif;
		font-weight: map-get($fallback, $fontstack);
	}

	html:lang(th) & { // Thailand
		font-family: map-get($leelawadee, $fontstack), map-get($segoe, $fontstack), Segoe UI, Tahoma, Arial, sans-serif;
	}
}

.foo {
  @include font(light);
}

.bar {
  @include font(normal);
}

.baz {
  @include font(semibold);
}

.boo {
  @include font(bold);
}

SassMeister-output.css

@charset "UTF-8";
.foo {
  font-family: "wf_segoe-ui_light", Segoe UI, Tahoma, Arial, sans-serif;
}
html:lang(bg) .foo, html:lang(cs) .foo, html:lang(el) .foo, html:lang(ko) .foo, html:lang(lt) .foo, html:lang(pl) .foo, html:lang(ro) .foo
html:lang(ru) .foo, html:lang(vi) .foo {
  font-family: Tahoma, Arial, sans-serif;
  font-weight: normal;
}
html:lang(zh) .foo {
  font-family: "YaHei UI", "Microsoft yahei", 微软雅黑, "wf_segoe-ui_light", Tahoma, Arial, sans-serif;
  font-weight: normal;
}
html:lang(ja) .foo {
  font-family: "Meiryo", メイリオ, "wf_segoe-ui_light", Tahoma, Arial, sans-serif;
  font-weight: normal;
}
html:lang(th) .foo {
  font-family: "wf_leelawadee_normal", "wf_segoe-ui_light", Segoe UI, Tahoma, Arial, sans-serif;
}

.bar {
  font-family: "wf_segoe-ui_normal", Segoe UI, Tahoma, Arial, sans-serif;
}
html:lang(bg) .bar, html:lang(cs) .bar, html:lang(el) .bar, html:lang(ko) .bar, html:lang(lt) .bar, html:lang(pl) .bar, html:lang(ro) .bar
html:lang(ru) .bar, html:lang(vi) .bar {
  font-family: Tahoma, Arial, sans-serif;
  font-weight: normal;
}
html:lang(zh) .bar {
  font-family: "YaHei UI", "Microsoft yahei", 微软雅黑, "wf_segoe-ui_normal", Tahoma, Arial, sans-serif;
  font-weight: normal;
}
html:lang(ja) .bar {
  font-family: "Meiryo", メイリオ, "wf_segoe-ui_normal", Tahoma, Arial, sans-serif;
  font-weight: normal;
}
html:lang(th) .bar {
  font-family: "wf_leelawadee_normal", "wf_segoe-ui_normal", Segoe UI, Tahoma, Arial, sans-serif;
}

.baz {
  font-family: "wf_segoe-ui_semibold", Segoe UI, Tahoma, Arial, sans-serif;
}
html:lang(bg) .baz, html:lang(cs) .baz, html:lang(el) .baz, html:lang(ko) .baz, html:lang(lt) .baz, html:lang(pl) .baz, html:lang(ro) .baz
html:lang(ru) .baz, html:lang(vi) .baz {
  font-family: Tahoma, Arial, sans-serif;
  font-weight: bold;
}
html:lang(zh) .baz {
  font-family: "YaHei UI", "Microsoft yahei", 微软雅黑, "wf_segoe-ui_semibold", Tahoma, Arial, sans-serif;
  font-weight: bold;
}
html:lang(ja) .baz {
  font-family: "Meiryo", メイリオ, "wf_segoe-ui_semibold", Tahoma, Arial, sans-serif;
  font-weight: bold;
}
html:lang(th) .baz {
  font-family: "wf_leelawadee_bold", "wf_segoe-ui_semibold", Segoe UI, Tahoma, Arial, sans-serif;
}

.boo {
  font-family: "wf_segoe-ui_bold", Segoe UI, Tahoma, Arial, sans-serif;
}
html:lang(bg) .boo, html:lang(cs) .boo, html:lang(el) .boo, html:lang(ko) .boo, html:lang(lt) .boo, html:lang(pl) .boo, html:lang(ro) .boo
html:lang(ru) .boo, html:lang(vi) .boo {
  font-family: Tahoma, Arial, sans-serif;
  font-weight: bold;
}
html:lang(zh) .boo {
  font-family: "YaHei UI", "Microsoft yahei", 微软雅黑, "wf_segoe-ui_bold", Tahoma, Arial, sans-serif;
  font-weight: bold;
}
html:lang(ja) .boo {
  font-family: "Meiryo", メイリオ, "wf_segoe-ui_bold", Tahoma, Arial, sans-serif;
  font-weight: bold;
}
html:lang(th) .boo {
  font-family: "wf_leelawadee_bold", "wf_segoe-ui_bold", Segoe UI, Tahoma, Arial, sans-serif;
}