JavaScript Feature Reference: getPrototypeOf() Method Web Browser Support Test

Last reviewed/updated: 04 Dec 2017 | Published: 04 Dec 2017 | Status: Active
Web browser support: Internet Explorer 10+, Edge 12+, Firefox 6+, Chrome 30+, Opera 17+

1. Introduction

In this web page there are two web browser JavaScript feature support tests; 1.) a feature implementation test, and 2.) a feature capability test. First, the implementation test is run. The implementation test determines if the web browser recognizes the JavaScript getPrototypeOf() method. The implementation test is a simple test for the presence of web browser support, and a definitive test for the absence of web browser support. If the web browser does not recognize the JavaScript getPrototypeOf() method, the testing is stopped and the implementation test reports: Fail (no support): The web browser does not recognize the JavaScript getPrototypeOf() method. The web browser does not support the JavaScript getPrototypeOf() method.

If the web browser recognizes the JavaScript getPrototypeOf() method, the capability test is run. The capability test determines if the web browser's implementation of the JavaScript getPrototypeOf() method includes support for at least one getPrototypeOf() method capability. The capability test is a more definitive, albeit not an all inclusive, test for the presence of web browser support. If the web browser's implementation of the JavaScript getPrototypeOf() method includes support for the tested capability, the capability test reports: Pass (at least partial/possibly full support): The web browser recognizes the JavaScript getPrototypeOf() method, and supports at least one getPrototypeOf() method capability. The web browser at least partially/possibly fully supports the JavaScript getPrototypeOf() method. Positive determination of full web browser support is beyond the scope of this test. If the web browser's implementation of the JavaScript getPrototypeOf() method does not include support for the tested capability, the capability test reports: Pass/Fail (partial support): The web browser recognizes the JavaScript getPrototypeOf() method, but does not support at least one getPrototypeOf() method capability. The web browser partially supports the JavaScript getPrototypeOf() method.

The web browser support test source code is shown in Section 2.1. The web browser support test source code is run in Section 2.2, which shows the web browser support test result.

1.1. getPrototypeOf() Method Web Browser Support

Pass (at least partial/possibly full support): IE9+, ED12+, FF3.5+, SF5+, CH5+, OP11.60+.

1.2. Abbreviations

  • IE = Internet Explorer.
  • ED = Edge = EdgeHTML rendering engine (ED12+) and/or Edge browser (ED20+).
  • FF = Firefox.
  • SF = Safari.
  • CH = Chrome.
  • OP = Opera.

2. getPrototypeOf() Method Web Browser Support Test

2.1. Web Browser Support Test Source Code

<script>
if (Object.getPrototypeOf){
 Object.prototype.propertyOne = "Object prototype propertyOne value"; // Set property on Object prototype.
 var objectViaObjectConstructor = new Object(); // Instantiate instance of Object as objectViaObjectConstructor.
 function CustomConstructor(){} // CustomConstructor constructor.
 CustomConstructor.prototype.propertyOne = "CustomConstructor prototype propertyOne value"; // Set property on CustomConstructor prototype.
 var objectViaCustomConstructor = new CustomConstructor(); // Instantiate instance of CustomConstructor as objectViaCustomConstructor.
 var objectLiteral = {}; // Instantiate instance of Object as objectLiteral.
 if ((Object.getPrototypeOf(objectViaObjectConstructor) === Object.prototype) && (Object.getPrototypeOf(objectViaObjectConstructor).propertyOne === "Object prototype propertyOne value") && (Object.getPrototypeOf(objectViaCustomConstructor) === CustomConstructor.prototype) && (Object.getPrototypeOf(objectViaCustomConstructor).propertyOne === "CustomConstructor prototype propertyOne value") && (Object.getPrototypeOf(objectLiteral) === Object.prototype) && (Object.getPrototypeOf(objectLiteral).propertyOne === "Object prototype propertyOne value")){
  document.write("<p><b>Pass</b> (at least partial/possibly full support): The web browser recognizes the JavaScript <code>getPrototypeOf()</code> method, and supports at least one <code>getPrototypeOf()</code> method capability. The web browser at least partially/possibly fully supports the JavaScript <code>getPrototypeOf()</code> method. Positive determination of full web browser support is beyond the scope of this test.</p>");
 } else {
  document.write("<p><b>Pass/Fail</b> (partial support): The web browser recognizes the JavaScript <code>getPrototypeOf()</code> method, but does not support at least one <code>getPrototypeOf()</code> method capability. The web browser partially supports the JavaScript <code>getPrototypeOf()</code> method.</p>");
 }
} else {
 document.write("<p><b>Fail</b> (no support): The web browser does not recognize the JavaScript <code>getPrototypeOf()</code> method. The web browser does not support the JavaScript <code>getPrototypeOf()</code> method.</p>");
}
</script>

2.2. Web Browser Support Test Result


3. Resources And Additional Information