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jQuery doesn’t respond: JSFiddle?

Here is my JsFiddle link. I’m testing that jQuery works, but it doesn’t. Have I made any mistakes? I have checked documentation of jQuery and everything seems to be okay. What’s wrong?

$(document).ready(function() {
    //insert code here
    alert("this will flre when the DOM is loaded.");


Select the library first as given in the image below

enter image description here

Then you can call jQuery as below

    alert("All is well");

Check out this live fiddle