diff --git a/src/__tests__/node.mjs b/src/__tests__/node.mjs
index f248bd5..859bc2f 100644
--- a/src/__tests__/node.mjs
+++ b/src/__tests__/node.mjs
@@ -99,8 +99,8 @@ test('Node#isAtPosition', (t) => {
         let notSelector = pseudoNot.first;
         t.deepEqual(notSelector.isAtPosition(1, 1), false);
         t.deepEqual(notSelector.isAtPosition(1, 4), false);
-        t.deepEqual(notSelector.isAtPosition(1, 5), true);
         t.deepEqual(notSelector.isAtPosition(1, 6), true);
+        t.deepEqual(notSelector.isAtPosition(1, 7), true);
         t.deepEqual(notSelector.isAtPosition(1, 9), true);
         t.deepEqual(notSelector.isAtPosition(1, 10), true);
         t.deepEqual(notSelector.isAtPosition(1, 11), false);
diff --git a/src/__tests__/sourceIndex.mjs b/src/__tests__/sourceIndex.mjs
index f99003d..258cfca 100644
--- a/src/__tests__/sourceIndex.mjs
+++ b/src/__tests__/sourceIndex.mjs
@@ -1,12 +1,18 @@
 import {test} from './util/helpers.mjs';
 
 test('universal selector', '*', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 1);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
 });
 
 test('lobotomized owl selector', ' * + * ', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 6);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 2);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 2);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 1);
@@ -19,12 +25,18 @@ test('lobotomized owl selector', ' * + * ', (t, tree) => {
 });
 
 test('comment', '/**\n * Hello!\n */', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 3);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 3);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
 });
 
 test('comment & universal selectors', '*/*test*/*', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 10);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
@@ -37,27 +49,42 @@ test('comment & universal selectors', '*/*test*/*', (t, tree) => {
 });
 
 test('tag selector', 'h1', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 2);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 2);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
 });
 
 test('id selector', '#id', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 3);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 3);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
 });
 
 test('tag selector followed by id selector', 'h1, #id', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 2);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 2);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
+    t.deepEqual(tree.nodes[1].source.start.column, 4);
+    t.deepEqual(tree.nodes[1].source.end.column, 7);
+    t.deepEqual(tree.nodes[1].sourceIndex, 3);
     t.deepEqual(tree.nodes[1].nodes[0].source.start.column, 5);
     t.deepEqual(tree.nodes[1].nodes[0].source.end.column, 7);
     t.deepEqual(tree.nodes[1].nodes[0].sourceIndex, 4);
 });
 
 test('multiple id selectors', '#one#two', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 8);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 4);
     t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
@@ -67,6 +94,9 @@ test('multiple id selectors', '#one#two', (t, tree) => {
 });
 
 test('multiple id selectors (2)', '#one#two#three#four', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 19);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[2].source.start.column, 9);
     t.deepEqual(tree.nodes[0].nodes[2].source.end.column, 14);
     t.deepEqual(tree.nodes[0].nodes[2].sourceIndex, 8);
@@ -76,24 +106,39 @@ test('multiple id selectors (2)', '#one#two#three#four', (t, tree) => {
 });
 
 test('multiple id selectors (3)', '#one#two,#three#four', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 8);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[1].source.start.column, 5);
     t.deepEqual(tree.nodes[0].nodes[1].source.end.column, 8);
     t.deepEqual(tree.nodes[0].nodes[1].sourceIndex, 4);
+    t.deepEqual(tree.nodes[1].source.start.column, 10);
+    t.deepEqual(tree.nodes[1].source.end.column, 20);
+    t.deepEqual(tree.nodes[1].sourceIndex, 9);
     t.deepEqual(tree.nodes[1].nodes[1].source.start.column, 16);
     t.deepEqual(tree.nodes[1].nodes[1].source.end.column, 20);
     t.deepEqual(tree.nodes[1].nodes[1].sourceIndex, 15);
 });
 
 test('multiple class selectors', '.one.two,.three.four', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 8);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[1].source.start.column, 5);
     t.deepEqual(tree.nodes[0].nodes[1].source.end.column, 8);
     t.deepEqual(tree.nodes[0].nodes[1].sourceIndex, 4);
+    t.deepEqual(tree.nodes[1].source.start.column, 10);
+    t.deepEqual(tree.nodes[1].source.end.column, 20);
+    t.deepEqual(tree.nodes[1].sourceIndex, 9);
     t.deepEqual(tree.nodes[1].nodes[1].source.start.column, 16);
     t.deepEqual(tree.nodes[1].nodes[1].source.end.column, 20);
     t.deepEqual(tree.nodes[1].nodes[1].sourceIndex, 15);
 });
 
 test('attribute selector', '[name="james"]', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 14);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.line, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
     t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 14);
@@ -130,11 +175,33 @@ test('pseudo-class', 'h1:first-child', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[1].sourceIndex, 2);
 });
 
+test('pseudo-class without argument', ':not()', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 6);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
+    t.deepEqual(tree.nodes[0].nodes[0].source.start.line, 1);
+    t.deepEqual(tree.nodes[0].nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].nodes[0].source.end.column, 6);
+    t.deepEqual(tree.nodes[0].nodes[0].sourceIndex, 0);
+    t.deepEqual(tree.nodes[0].nodes[0].nodes[0].source.start.column, 6);
+    t.deepEqual(tree.nodes[0].nodes[0].nodes[0].source.end.column, 6);
+    t.deepEqual(tree.nodes[0].nodes[0].nodes[0].sourceIndex, 5);
+});
+
 test('pseudo-class with argument', 'h1:not(.strudel, .food)', (t, tree) => {
+    t.deepEqual(tree.nodes[0].source.start.column, 1);
+    t.deepEqual(tree.nodes[0].source.end.column, 23);
+    t.deepEqual(tree.nodes[0].sourceIndex, 0);
     t.deepEqual(tree.nodes[0].nodes[1].source.start.line, 1);
     t.deepEqual(tree.nodes[0].nodes[1].source.start.column, 3);
     t.deepEqual(tree.nodes[0].nodes[1].source.end.column, 23);
     t.deepEqual(tree.nodes[0].nodes[1].sourceIndex, 2);
+    t.deepEqual(tree.nodes[0].nodes[1].nodes[0].source.start.column, 8);
+    t.deepEqual(tree.nodes[0].nodes[1].nodes[0].source.end.column, 15);
+    t.deepEqual(tree.nodes[0].nodes[1].nodes[0].sourceIndex, 7);
+    t.deepEqual(tree.nodes[0].nodes[1].nodes[1].source.start.column, 17);
+    t.deepEqual(tree.nodes[0].nodes[1].nodes[1].source.end.column, 23);
+    t.deepEqual(tree.nodes[0].nodes[1].nodes[1].sourceIndex, 16);
 });
 
 test('pseudo-element', 'h1::before', (t, tree) => {
diff --git a/src/parser.js b/src/parser.js
index 577b89c..4815c6e 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -131,7 +131,10 @@ export default class Parser {
         this.root.errorGenerator = this._errorGenerator();
 
 
-        const selector = new Selector({source: {start: {line: 1, column: 1}}});
+        const selector = new Selector({
+            source: {start: {line: 1, column: 1}},
+            sourceIndex: 0,
+        });
         this.root.append(selector);
         this.current = selector;
 
@@ -608,7 +611,12 @@ export default class Parser {
             return;
         }
         this.current._inferEndPosition();
-        const selector = new Selector({source: {start: tokenStart(this.tokens[this.position + 1])}});
+        const selector = new Selector({
+            source: {
+                start: tokenStart(this.tokens[this.position + 1]),
+            },
+            sourceIndex: this.tokens[this.position + 1][TOKEN.START_POS],
+        });
         this.current.parent.append(selector);
         this.current = selector;
         this.position ++;
@@ -685,7 +693,10 @@ export default class Parser {
         let unbalanced = 1;
         this.position ++;
         if (last && last.type === types.PSEUDO) {
-            const selector = new Selector({source: {start: tokenStart(this.tokens[this.position - 1])}});
+            const selector = new Selector({
+                source: {start: tokenStart(this.tokens[this.position])},
+                sourceIndex: this.tokens[this.position][TOKEN.START_POS],
+            });
             const cache = this.current;
             last.append(selector);
             this.current = selector;