| 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                Testing Center tests (possibly outdated) | 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                Testing Center tests (possibly outdated) | 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                Testing Center tests (possibly outdated) | 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                Testing Center tests (possibly outdated) | 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                Testing Center tests (possibly outdated) | 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) |