test for attribute name only selector

test/css/samples/attribute-selector-only-name/_config.js

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+export default {
+	cascade: false
+};

test/css/samples/attribute-selector-only-name/expected.css

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+[foo][svelte-xyz]{color:red}

test/css/samples/attribute-selector-only-name/input.html

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+<div foo='bar'></div>
+
+<style>
+	[foo] {
+		color: red;
+	}
+</style>