extensions/emmet/src/removeTag.ts/entireLineIsTag
function entireLineIsTag(document: vscode.TextDocument, range: vscode.Range): boolean {
	if (range.start.line === range.end.line) {
		const lineText = document.lineAt(range.start).text;
		const tagText = document.getText(range);
		if (lineText.trim() === tagText) {
			return true;
		}
	}
	return false;
}