CSS字符串规范

字符串、URL 应该始终被单引号(‘)所包裹,initialsans-serif 的专用名词无须引用起来

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// Yep
$direction: 'left';
// Nope
$direction: left;

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// Yep
.foo {
background-image: url('/images/kittens.jpg');
}
// Nope
.foo {
background-image: url(/images/kittens.jpg);
}
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// Yep
$font-type: sans-serif;
// Nope
$font-type: 'sans-serif';
// Okay I guess
$font-type: unquote('sans-serif');
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// Okay
@warn 'You can\'t do that.';
// Okay
@warn "You can't do that.";
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