| let | 
        None | 
        IE
                Testing Center tests (possibly outdated) | 
    
    
        | const | 
        None | 
        IE
                Testing Center tests (possibly outdated) | 
    
    
        | Computed properties | 
        None | 
         | 
    
    
        | Arrow functions | 
        None | 
         | 
    
    
        | Block-level function declarations | 
        None | 
         | 
    
    
        | \u{} Escape Sequence | 
        None | 
         | 
    
    
        | class | 
        None | 
         | 
    
    
        | Default function params | 
        None | 
         | 
    
    
        | Rest parameters | 
        None | 
         | 
    
    
        | Destructuring | 
        None | 
         | 
    
    
        | Spread operator | 
        None | 
         | 
    
    
        | Modules | 
        None | 
         | 
    
    
        | For-of | 
        None | 
         | 
    
    
        | Array comprehensions | 
        None | 
         | 
    
    
        | Generator comprehensions | 
        None | 
         | 
    
    
        | Iterators | 
        None | 
         | 
    
    
        | Generators | 
        None | 
         | 
    
    
        | Template Strings | 
        None | 
         | 
    
    
        | RegExp "y" flag | 
        None | 
         | 
    
    
        | Map | 
        None | 
        IE
                Testing Center tests (possibly outdated) | 
    
    
        | Set | 
        None | 
        IE
                Testing Center tests (possibly outdated) | 
    
    
        | WeakMap | 
        None | 
        IE
                Testing Center tests (possibly outdated) | 
    
    
        | WeakSet | 
        None | 
         | 
    
    
        | Proxy | 
        None | 
         | 
    
    
        | Typed Arrays | 
        None | 
         | 
    
    
        | Symbol | 
        None | 
         | 
    
    
        | Promise | 
        None | 
         | 
    
    
        | Object.assign | 
        None | 
         | 
    
    
        | Object.is | 
        None | 
         | 
    
    
        | Object.setPrototypeOf | 
        None | 
         | 
    
    
        | String.fromCodePoint | 
        None | 
         | 
    
    
        | String.prototype.codePointAt | 
        None | 
         | 
    
    
        | String.prototype.repeat | 
        None | 
         | 
    
    
        | String.prototype.startsWith | 
        None | 
         | 
    
    
        | String.prototype.endsWith | 
        None | 
         | 
    
    
        | String.prototype.includes | 
        None | 
         | 
    
    
        | String.prototype.toArray | 
        None | 
         | 
    
    
        | Array.from | 
        None | 
         | 
    
    
        | Array.of | 
        None | 
         | 
    
    
        | Array.prototype.find | 
        None | 
         | 
    
    
        | Array.prototype.findIndex | 
        None | 
         | 
    
    
        | Array.prototype.fill | 
        None | 
         | 
    
    
        | Number.isFinite | 
        None | 
         | 
    
    
        | Number.isInteger | 
        None | 
         | 
    
    
        | Number.isNaN | 
        None | 
         | 
    
    
        | Number.toInteger | 
        None | 
         | 
    
    
        | Number.prototype.clz | 
        None | 
         | 
    
    
        | Math.imul | 
        None | 
         | 
    
    
        | Math.sign | 
        None | 
         | 
    
    
        | Math.log10 | 
        None | 
         | 
    
    
        | Math.log2 | 
        None | 
         | 
    
    
        | Math.log1p | 
        None | 
         | 
    
    
        | Math.expm1 | 
        None | 
         | 
    
    
        | Math.cosh | 
        None | 
         | 
    
    
        | Math.sinh | 
        None | 
         | 
    
    
        | Math.tanh | 
        None | 
         | 
    
    
        | Math.acosh | 
        None | 
         | 
    
    
        | Math.asinh | 
        None | 
         | 
    
    
        | Math.atanh | 
        None | 
         | 
    
    
        | Math.hypot | 
        None | 
         | 
    
    
        | Math.trunc | 
        None | 
         | 
    
    
        | Math.fround | 
        None | 
         | 
    
    
        | __proto__ | 
        None | 
        IE
                Testing Center tests (possibly outdated) |