diff --git a/README.md b/README.md
index b6abc379..c2434547 100644
--- a/README.md
+++ b/README.md
@@ -134,6 +134,8 @@ The available options are:
   --mangle-props                Mangle property names
   --mangle-regex                Only mangle property names matching the regex
   --name-cache                  File to hold mangled names mappings
+  --pure-funcs                  List of functions that can be safely removed if
+                                their return value is not used           [array]
 ```
 
 Specify `--output` (`-o`) to declare the output file.  Otherwise the output
diff --git a/bin/uglifyjs b/bin/uglifyjs
index f82d43cb..ca75f159 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -72,6 +72,7 @@ You need to pass an argument to this option to specify the name that your module
     .describe("mangle-props", "Mangle property names")
     .describe("mangle-regex", "Only mangle property names matching the regex")
     .describe("name-cache", "File to hold mangled names mappings")
+    .describe("pure-funcs", "List of functions that can be safely removed if their return value is not used")
 
     .alias("p", "prefix")
     .alias("o", "output")
@@ -104,6 +105,7 @@ You need to pass an argument to this option to specify the name that your module
     .string("prefix")
     .string("name-cache")
     .array("reserved-file")
+    .array("pure-funcs")
 
     .boolean("expr")
     .boolean("source-map-include-sources")
@@ -175,6 +177,10 @@ if (ARGS.d) {
     if (COMPRESS) COMPRESS.global_defs = getOptions("d");
 }
 
+if (ARGS.pure_funcs) {
+    if (COMPRESS) COMPRESS.pure_funcs = ARGS.pure_funcs;
+}
+
 if (ARGS.r) {
     if (MANGLE) MANGLE.except = ARGS.r.replace(/^\s+|\s+$/g).split(/\s*,+\s*/);
 }
diff --git a/lib/output.js b/lib/output.js
index 5aeed667..177a772c 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -88,13 +88,14 @@ function OutputStream(options) {
 
     function make_string(str, quote) {
         var dq = 0, sq = 0;
-        str = str.replace(/[\\\b\f\n\r\t\x22\x27\u2028\u2029\0\ufeff]/g, function(s){
+        str = str.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g, function(s){
             switch (s) {
               case "\\": return "\\\\";
               case "\b": return "\\b";
               case "\f": return "\\f";
               case "\n": return "\\n";
               case "\r": return "\\r";
+              case "\v": return "\\v";
               case "\u2028": return "\\u2028";
               case "\u2029": return "\\u2029";
               case '"': ++dq; return '"';
@@ -125,8 +126,11 @@ function OutputStream(options) {
 
     function encode_string(str, quote) {
         var ret = make_string(str, quote);
-        if (options.inline_script)
+        if (options.inline_script) {
             ret = ret.replace(/<\x2fscript([>\/\t\n\f\r ])/gi, "<\\/script$1");
+            ret = ret.replace(/\x3c!--/g, "\\x3c!--");
+            ret = ret.replace(/--\x3e/g, "--\\x3e");
+        }
         return ret;
     };
 
@@ -1114,16 +1118,24 @@ function OutputStream(options) {
         output.print(self.operator);
     });
     DEFPRINT(AST_Binary, function(self, output){
+        var op = self.operator;
         self.left.print(output);
-        output.space();
-        output.print(self.operator);
-        if (self.operator == "<"
+        if (op[0] == ">" /* ">>" ">>>" ">" ">=" */
+            && self.left instanceof AST_UnaryPostfix
+            && self.left.operator == "--") {
+            // space is mandatory to avoid outputting -->
+            output.print(" ");
+        } else {
+            // the space is optional depending on "beautify"
+            output.space();
+        }
+        output.print(op);
+        if ((op == "<" || op == "<<")
             && self.right instanceof AST_UnaryPrefix
             && self.right.operator == "!"
             && self.right.expression instanceof AST_UnaryPrefix
             && self.right.expression.operator == "--") {
             // space is mandatory to avoid outputting <!--
-            // http://javascript.spec.whatwg.org/#comment-syntax
             output.print(" ");
         } else {
             // the space is optional depending on "beautify"
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index 760575c0..3dd77149 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -115,9 +115,9 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz"
     },
     "yargs": {
-      "version": "3.5.4",
-      "from": "yargs@>=3.5.4 <3.6.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.5.4.tgz"
+      "version": "3.10.0",
+      "from": "yargs@>=3.10.0 <3.11.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz"
     },
     "zeparser": {
       "version": "0.0.7",
diff --git a/package.json b/package.json
index c172be39..953ab1a5 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "async": "~0.2.6",
     "source-map": "~0.5.1",
     "uglify-to-browserify": "~1.0.0",
-    "yargs": "~3.5.4"
+    "yargs": "~3.10.0"
   },
   "devDependencies": {
     "acorn": "~0.6.0",
diff --git a/test/compress/html_comments.js b/test/compress/html_comments.js
new file mode 100644
index 00000000..8495b433
--- /dev/null
+++ b/test/compress/html_comments.js
@@ -0,0 +1,71 @@
+html_comment_in_expression: {
+    input: {
+        function f(a, b, x, y) { return a < !--b && x-- > y; }
+    }
+    expect_exact: "function f(a,b,x,y){return a< !--b&&x-- >y}";
+}
+
+html_comment_in_less_than: {
+    input: {
+        function f(a, b) { return a < !--b; }
+    }
+    expect_exact: "function f(a,b){return a< !--b}";
+}
+
+html_comment_in_left_shift: {
+    input: {
+        function f(a, b) { return a << !--b; }
+    }
+    expect_exact: "function f(a,b){return a<< !--b}";
+}
+
+html_comment_in_right_shift: {
+    input: {
+        function f(a, b) { return a-- >> b; }
+    }
+    expect_exact: "function f(a,b){return a-- >>b}";
+}
+
+html_comment_in_zero_fill_right_shift: {
+    input: {
+        function f(a, b) { return a-- >>> b; }
+    }
+    expect_exact: "function f(a,b){return a-- >>>b}";
+}
+
+html_comment_in_greater_than: {
+    input: {
+        function f(a, b) { return a-- > b; }
+    }
+    expect_exact: "function f(a,b){return a-- >b}";
+}
+
+html_comment_in_greater_than_or_equal: {
+    input: {
+        function f(a, b) { return a-- >= b; }
+    }
+    expect_exact: "function f(a,b){return a-- >=b}";
+}
+
+html_comment_in_right_shift_assign: {
+    input: {
+        // Note: illegal javascript
+        function f(a, b) { return a-- >>= b; }
+    }
+    expect_exact: "function f(a,b){return a-- >>=b}";
+}
+
+html_comment_in_zero_fill_right_shift_assign: {
+    input: {
+        // Note: illegal javascript
+        function f(a, b) { return a-- >>>= b; }
+    }
+    expect_exact: "function f(a,b){return a-- >>>=b}";
+}
+
+html_comment_in_string_literal: {
+    input: {
+        function f() { return "<!--HTML-->comment in<!--string literal-->"; }
+    }
+    expect_exact: 'function f(){return"\\x3c!--HTML--\\x3ecomment in\\x3c!--string literal--\\x3e"}';
+}
diff --git a/test/run-tests.js b/test/run-tests.js
index ea8d03e4..5abca810 100755
--- a/test/run-tests.js
+++ b/test/run-tests.js
@@ -194,7 +194,7 @@ function parse_test(file) {
 
 function make_code(ast, beautify) {
     if (arguments.length == 1) beautify = true;
-    var stream = U.OutputStream({ beautify: beautify });
+    var stream = U.OutputStream({ beautify: beautify, inline_script: true });
     ast.print(stream);
     return stream.get();
 }