Add `CheckObjectCoercible` for the `String.prototype` HTML methods

test/mjsunit/es6/string-html.js

Index: test/mjsunit/es6/string-html.js
diff --git a/test/mjsunit/es6/string-html.js b/test/mjsunit/es6/string-html.js
new file mode 100644
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--- /dev/null
+++ b/test/mjsunit/es6/string-html.js
@@ -0,0 +1,159 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Tests taken from:
+// http://mathias.html5.org/tests/javascript/string/
+
+assertEquals('_'.anchor('b'), '<a name="b">_</a>');
+//assertEquals('<'.anchor('<'), '<a name="<"><</a>'); // #2217
+assertEquals('_'.anchor(0x2A), '<a name="42">_</a>');
+assertEquals('_'.anchor('\x22'), '<a name="&quot;">_</a>');
+assertEquals(String.prototype.anchor.call(0x2A, 0x2A), '<a name="42">42</a>');
+assertThrows(function() {
+  String.prototype.anchor.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.anchor.call(null);
+}, TypeError);
+assertEquals(String.prototype.anchor.length, 1);
+
+assertEquals('_'.big(), '<big>_</big>');
+assertEquals('<'.big(), '<big><</big>');
+assertEquals(String.prototype.big.call(0x2A), '<big>42</big>');
+assertThrows(function() {
+  String.prototype.big.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.big.call(null);
+}, TypeError);
+assertEquals(String.prototype.big.length, 0);
+
+assertEquals('_'.blink(), '<blink>_</blink>');
+assertEquals('<'.blink(), '<blink><</blink>');
+assertEquals(String.prototype.blink.call(0x2A), '<blink>42</blink>');
+assertThrows(function() {
+  String.prototype.blink.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.blink.call(null);
+}, TypeError);
+assertEquals(String.prototype.blink.length, 0);
+
+assertEquals('_'.bold(), '<b>_</b>');
+assertEquals('<'.bold(), '<b><</b>');
+assertEquals(String.prototype.bold.call(0x2A), '<b>42</b>');
+assertThrows(function() {
+  String.prototype.bold.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.bold.call(null);
+}, TypeError);
+assertEquals(String.prototype.bold.length, 0);
+
+assertEquals('_'.fixed(), '<tt>_</tt>');
+assertEquals('<'.fixed(), '<tt><</tt>');
+assertEquals(String.prototype.fixed.call(0x2A), '<tt>42</tt>');
+assertThrows(function() {
+  String.prototype.fixed.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.fixed.call(null);
+}, TypeError);
+assertEquals(String.prototype.fixed.length, 0);
+
+assertEquals('_'.fontcolor('b'), '<font color="b">_</font>');
+//assertEquals('<'.fontcolor('<'), '<font color="<"><</font>'); // #2217
+assertEquals('_'.fontcolor(0x2A), '<font color="42">_</font>');
+assertEquals('_'.fontcolor('\x22'), '<font color="&quot;">_</font>');
+assertEquals(String.prototype.fontcolor.call(0x2A, 0x2A),
+  '<font color="42">42</font>');
+assertThrows(function() {
+  String.prototype.fontcolor.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.fontcolor.call(null);
+}, TypeError);
+assertEquals(String.prototype.fontcolor.length, 1);
+
+assertEquals('_'.fontsize('b'), '<font size="b">_</font>');
+//assertEquals('<'.fontsize('<'), '<font size="<"><</font>'); // #2217
+assertEquals('_'.fontsize(0x2A), '<font size="42">_</font>');
+assertEquals('_'.fontsize('\x22'), '<font size="&quot;">_</font>');
+assertEquals(String.prototype.fontsize.call(0x2A, 0x2A),
+  '<font size="42">42</font>');
+assertThrows(function() {
+  String.prototype.fontsize.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.fontsize.call(null);
+}, TypeError);
+assertEquals(String.prototype.fontsize.length, 1);
+
+assertEquals('_'.italics(), '<i>_</i>');
+assertEquals('<'.italics(), '<i><</i>');
+assertEquals(String.prototype.italics.call(0x2A), '<i>42</i>');
+assertThrows(function() {
+  String.prototype.italics.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.italics.call(null);
+}, TypeError);
+assertEquals(String.prototype.italics.length, 0);
+
+assertEquals('_'.link('b'), '<a href="b">_</a>');
+//assertEquals('<'.link('<'), '<a href="<"><</a>'); // #2217
+assertEquals('_'.link(0x2A), '<a href="42">_</a>');
+assertEquals('_'.link('\x22'), '<a href="&quot;">_</a>');
+assertEquals(String.prototype.link.call(0x2A, 0x2A), '<a href="42">42</a>');
+assertThrows(function() {
+  String.prototype.link.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.link.call(null);
+}, TypeError);
+assertEquals(String.prototype.link.length, 1);
+
+assertEquals('_'.small(), '<small>_</small>');
+assertEquals('<'.small(), '<small><</small>');
+assertEquals(String.prototype.small.call(0x2A), '<small>42</small>');
+assertThrows(function() {
+  String.prototype.small.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.small.call(null);
+}, TypeError);
+assertEquals(String.prototype.small.length, 0);
+
+assertEquals('_'.strike(), '<strike>_</strike>');
+assertEquals('<'.strike(), '<strike><</strike>');
+assertEquals(String.prototype.strike.call(0x2A), '<strike>42</strike>');
+assertThrows(function() {
+  String.prototype.strike.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.strike.call(null);
+}, TypeError);
+assertEquals(String.prototype.strike.length, 0);
+
+assertEquals('_'.sub(), '<sub>_</sub>');
+assertEquals('<'.sub(), '<sub><</sub>');
+assertEquals(String.prototype.sub.call(0x2A), '<sub>42</sub>');
+assertThrows(function() {
+  String.prototype.sub.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.sub.call(null);
+}, TypeError);
+assertEquals(String.prototype.sub.length, 0);
+
+assertEquals('_'.sup(), '<sup>_</sup>');
+assertEquals('<'.sup(), '<sup><</sup>');
+assertEquals(String.prototype.sup.call(0x2A), '<sup>42</sup>');
+assertThrows(function() {
+  String.prototype.sup.call(undefined);
+}, TypeError);
+assertThrows(function() {
+  String.prototype.sup.call(null);
+}, TypeError);
+assertEquals(String.prototype.sup.length, 0);