try this:
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Studytonight

When the browser's width is 600px wide or less, hide the h1 element. Resize the browser window to see the effect.

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Here is the answer:
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Country	Independence Day
India	15th August, 1947
USA	4th July, 1776
China	1st October, 1949

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Your code looks ok to me, can you share what error you get?
Here is what worked for me:
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function greet(name="NULL")
{
if(name!="NULL")
{
console.log("Hello "+name+"! Thanks for joining us.");
}
else {
console.log("What is your name?");
}
}
// call the function
greet("Abhishek");
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Here is the answer:
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Login Form

Email

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Here is the correct answer:
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let square = function (num)
{
return num*num
};
let result = square(5);
console.log(result);
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But JavaScript Level 5 doesn't have any lesson 7

Here is the correct answer:
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let a = 10;
let b = 20;
let c = a + b;

console.log(c);
document.write("Hello JS!")
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Are you accessing the content on Mobile? Then please go to the Editor Tab and then click on Next.

Here is the answer:
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Thanks for pointing this out. The content has been corrected.

This should work:
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Hello
Studytonight
Bro



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Here is the correct answer:
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Do you know?

Honey bees communicate by dancing.

Turtles can breathe through their !

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