Website changes for ES5-ish approach

website/guide/compatibility.html

@@ -6,7 +6,9 @@ extensions, frameworks, and test suites.</p>
 <h2 id="compatibility-e5">Ecmascript E5 / E5.1</h2>
 
 <p>The main compatibility goal of Duktape is to be Ecmascript E5/E5.1
-compatible.  Current level of compatibility should be quite high.</p>
+compatible.  However, ES5 feature semantics are updated to ES6 (or
+later) where incompatible changes have been made in newer specification
+versions.  Current level of compatibility should be quite high.</p>
 
 <h2 id="compatibility-e6">Ecmascript 2015 (E6)</h2>
 

website/guide/intro.html

@@ -40,7 +40,8 @@ Ecmascript throughout to refer to the language implemented by Duktape.</p>
 
 <h2>Conformance</h2>
 
-<p>Duktape conforms to ES5.0/ES5.1:</p>
+<p>Duktape conforms to ES5.0/ES5.1 with semantics updated from ES6 or later
+where appropriate:</p>
 <ul>
 <li><a href="http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262%205th%20edition%20December%202009.pdf">ECMAScript Language Specification 5th Edition</a></li>
 <li><a href="http://www.ecma-international.org/ecma-262/5.1/">ECMAScript&#x00ae; Language Specification 5.1 Edition</a></li>

website/index/index.html

@@ -38,8 +38,9 @@ Duktape API to call Ecmascript functions from C code and vice versa.</p>
 <ul>
 <li>Embeddable, portable, compact:
     can run on platforms with 192kB flash and 64kB system RAM</li>
-<li><a href="http://www.ecma-international.org/ecma-262/5.1/">Ecmascript E5/E5.1</a>
-    compliant, some features implemented from
+<li><a href="http://www.ecma-international.org/ecma-262/5.1/">Ecmascript E5/E5.1</a>,
+    with some semantics updated from ES6+</li>
+<li>Partial support for
     <a href="http://www.ecma-international.org/ecma-262/6.0/index.html">Ecmascript 2015 (E6)</a> and
     <a href="http://www.ecma-international.org/ecma-262/7.0/index.html">Ecmascript 2016 (E7)</a></li>
 <li>Khronos/ES6 <a href="https://www.khronos.org/registry/typedarray/specs/latest/">TypedArray</a>