div
span[foo=bar]
  color red

div input,
input:nth-child(2n)
  color red

#foo
  .bar::before
    color red

#foo
  .bar {
color red
}

{foo} {bar}:hover
  color red

div    // comment
	display inline-block // comment

----------------------------------------------------

[
	["selector", ["div\r\nspan[foo=bar]"]],
	["property-declaration", [["property", ["color"]], ["color", "red"]]],
	["selector", ["div input", ["punctuation", ","], "\r\ninput:nth-child(2n)"]],
	["property-declaration", [["property", ["color"]], ["color", "red"]]],
	["selector", ["#foo"]],
	["selector", [".bar::before"]],
	["property-declaration", [["property", ["color"]], ["color", "red"]]],
	["selector", ["#foo"]],
	["selector", [".bar ", ["punctuation", "{"]]],
	["property-declaration", [["property", ["color"]], ["color", "red"]]],
	["punctuation", "}"],
	["selector", [
		["interpolation", [
			["delimiter", "{"], "foo", ["delimiter", "}"]
		]],
		["interpolation", [
			["delimiter", "{"], "bar", ["delimiter", "}"]
		]],
		":hover"
	]],
	["property-declaration", [["property", ["color"]], ["color", "red"]]],
	["selector", ["div    ", ["comment", "// comment"]]],
	["property-declaration", [["property", ["display"]], " inline-block ", ["comment", "// comment"]]]
]

----------------------------------------------------

Checks for selectors.