javaScript reserved keywords

I am wondering how JavaScript's reserved keywords / functions are managed.

Example:

According to:

http://www.quackit.com/javascript/javascript_reserved_words.cfm

delete is a reserved keyword by JavaScript.

Then consider the following snippet for some context:

var cookieManager = {
    get: function (name) { 
        // function contents ...
        console.log("cookieManager.get() called");
        return true;
    },
    set: function (name, value, days) {
        // function contents ...
        console.log("cookieManager.set() called");
        return true;
    },
    delete: function (name) { 
        // function contents ...
        console.log("cookieManager.delete() called");
        return true;
    }
};

This object has a delete property, yet the name of it is reserved by JavaScript so it should fail, right?

Yet when I execute cookieManager.delete(); in the webconsole of FireFox I get the following output, suggesting that it works fine:

[11:26:00.654] cookieManager.delete();
[11:26:00.656] cookieManager.delete() called
[11:26:00.657] true

If, however, you run the code in JsLint it says

Problem at line 12 character 5: Expected an identifier and instead saw 'delete' (a reserved word).

delete: function (name) { 

Suggesting that this is a big no no approach and should be avoided.

So when should I take reserved keywords into consideration, as in this example it seems to work just like I want it to ( the delete keyword is in the context of the object cookieManager and thus causes no conflicts, hence it can be used ) or should I abide to the bible that is JsLint and rename anything that is a reserved keyword by javascript? In this context I could easily rename .delete() to .remove().