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test_polyfill.html
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<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Testing</title>
<style>
table {
border-collapse: collapse;
}
th, td {
border: 1px solid black;
padding: 4px;
}
td.null {
background-color: gray;
}
td.true {
background-color: lime;
}
td.false {
background-color: pink;
}
</style>
</head>
<body>
<table>
<thead>
<tr>
<th>Function</th>
<th>Supported?</th>
<th>Polyfill?</th>
</tr>
</thead>
<tbody id="result"></tbody>
</table>
<script>
var _try = function (x) {
return function() {
try {
eval(x);
return true;
} catch (ex) {
return false;
}
}
}
var _test = function (x) {
return function() {
return x;
}
}
var testcases = [
{
"name": "String.prototype.trimStart",
"test": function() { return !!String.prototype.trimStart;},
"polyfill": function() { return !!String.prototype.trimLeft;}
},
{
"name": "String.prototype.replaceAll",
"test": _test(!!String.prototype.replaceAll),
"polyfill": _test(!!String.prototype.replace)
},
{
"name": "ResizeObserver",
"test": _test(typeof(ResizeObserver) !== "undefined"),
"polyfill": _test(!!window.getComputedStyle)
},
{
"name": "CSS Custom properties",
"test": function() {
var temp = document.createElement("a");
temp.style.setProperty("--offset", "0");
return temp.style.getPropertyValue("--offset") === "0";
},
"polyfill": function() {return true;}
},
{
"name": "navigator.clipboard",
"test": _test(!!navigator.clipboard),
"polyfill": function() {return true;}
},
{
"name": "Array.prototype.includes",
"test": _test(!!Array.prototype.includes),
"polyfill": _test(!!(String.prototype.indexOf && String.prototype.slice))
},
{
"name": "[...[1]]",
"test": _try("[...[1]]"),
"polyfill": function() {return null;}
},
{
"name": "function (...a) {}",
"test": _try("{var x = function(...a){}}"),
"polyfill": function() {return null;}
},
{
"name": "let",
"test": _try("let y = 1"),
"polyfill": _try("var y = 1"),
},
{
"name": "**",
"test": _try("2 ** 3"),
"polyfill": _try("Math.pow(2, 3)"),
},
{
"name": "Arrow function expressions",
"test": _try("() => 1"),
"polyfill": _try("(function(){return 1})"),
},
{
"name": "NodeList.prototype.forEach",
"test": _test(!!NodeList.prototype.forEach),
"polyfill": _test(!!(Array.prototype.forEach && Array.from))
},
{
"name": "Array.from",
"test": _test(!!Array.from),
"polyfill": function() {return null;}
},
];
testcases.forEach(function (test) {
var tr = document.createElement("tr");
var td = document.createElement("td");
td.innerHTML = test.name;
tr.appendChild(td);
td = document.createElement("td");
var testresult = test.test();
td.innerHTML = testresult===null?"N/A":testresult?"Yes":"No";
td.className = testresult;
tr.appendChild(td);
td = document.createElement("td");
var testresult = test.polyfill();
td.innerHTML = testresult===null?"N/A":testresult?"Yes":"No";
td.className = testresult;
tr.appendChild(td);
result.appendChild(tr);
})
</script>
</body>
</html>