JavaScript Feature Reference: classList Property Web Browser Support Test
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 classList property. 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 classList property, the testing is stopped and the implementation test reports: Fail (no support): The web browser does not recognize the JavaScript
classList property. The web browser does not support the JavaScript classList property.
If the web browser recognizes the JavaScript classList property, the capability test is run. The capability test determines if the web browser's implementation of the JavaScript classList property includes support for at least one classList property 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 classList property includes support for the tested capability, the capability test reports: Pass (at least partial/possibly full support): The web browser recognizes the JavaScript
If the web browser's implementation of the JavaScript classList property, and supports at least one classList property capability. The web browser at least partially/possibly fully supports the JavaScript classList property. Positive determination of full web browser support is beyond the scope of this test.classList property does not include support for the tested capability, the capability test reports: Pass/Fail (partial support): The web browser recognizes the JavaScript
classList property, but does not support at least one classList property capability. The web browser partially supports the JavaScript classList property.
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. classList Property Web Browser Support
Pass (at least partial/possibly full support):
IE10+, ED12+, FF3.6+, SF5.1+, CH8+, OP11.50+.
1.2. Abbreviations
- IE = Internet Explorer.
- ED = Edge Legacy 12 - 18 (EdgeHTML based) and Edge 79+ (Chromium based).
- FF = Firefox.
- SF = Safari.
- CH = Chrome.
- OP = Opera.
2. classList Property Web Browser Support Test
2.1. Web Browser Support Test Source Code
<p id='testId' class='test-class-one test-class-two test-class-three'></p>
<script>
var element = document.getElementById("testId");
if (element.classList){
if (element.classList.length === 3){
document.write("<p><b>Pass</b> (at least partial/possibly full support): The web browser recognizes the JavaScript <code>classList</code> property, and supports at least one <code>classList</code> property capability. The web browser at least partially/possibly fully supports the JavaScript <code>classList</code> property. 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>classList</code> property, but does not support at least one <code>classList</code> property capability. The web browser partially supports the JavaScript <code>classList</code> property.</p>");
}
} else {
document.write("<p><b>Fail</b> (no support): The web browser does not recognize the JavaScript <code>classList</code> property. The web browser does not support the JavaScript <code>classList</code> property.</p>");
}
</script>