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<!DOCTYPE html>
<meta charset="utf-8">
<script>
/* eslint-disable no-console */
/* eslint-disable no-unused-expressions */
"use strict";
console.log(null);
console.error("%ccolored message", "background:green; color:white");
const obj = {
testSymbol: Symbol("sym"),
testobj: {},
testnumber: 1,
testArray: [1, {}, 2, 555],
testUndf: undefined,
testNull: null,
testFunc() {},
testString: 'string',
prop1: 'prop1',
prop2: 'prop2'
};
obj.c = obj;
obj.prop3 = 'prop3';
obj.prop4 = 'prop4';
console.log(obj);
const arr = [
'string',
{test: 'obj'},
null,
90,
undefined,
function() {},
[1, {}, 2, 555]
];
arr.push(arr);
console.log(arr);
document.access.non.existent.property.to.trigger.error;
</script>
<style>
body {background: rgb(0, 128, 0);}
</style>
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