If your computer does not support MP4 files, you may need to convert it to an alternate file format, such as MOV or AVI. To do this, you can use an online file conversion tool, such as Zamzar.

Once you have converted your file, you can use HTML tags to link it to your code. You may use a <video> tag, such as the following:

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<video width="320" height="240" controls>
  <source src="your_video_file.avi" type="video/avi">
</video>

A variable is a storage container that holds values that can be changed or updated throughout the program. A variable is typically used as a way to store data so it can be used later.

A function is a block of organized, reusable code used to perform a single, related action. Functions can take in parameters, which are used to store data and manipulate them. The output of a function is typically a return value. Functions make it easier for developers to write and maintain code by enabling them to break down a large problem into smaller, more manageable pieces.

You can add an emoji on HTML by using Unicode character escape codes. For example, &#x1F60A will show the 😊 emoji. Here is an example of how to use it in your HTML:

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<p>I am feeling 😊 today!</p>

To add a button to send an email, you can use HTML code along with an email address inside the href attribute. For example:

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<a href="mailto:example@gmail.com">
  <button type="button">Send Email</button>
</a>

You can write a code to call on click using JavaScript :

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// Get the button
var myButton = document.getElementById("myButton");

// Add an event listener
myButton.addEventListener("click", myFunction);

// define the function
function myFunction() {
  // do something when the button is clicked
}

HTML comments are used to explain code, hide HTML to make the code easier to read, and prevent execution of code. There are two elements of an HTML comment:

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<!-- This is an HTML comment -->

Yes, you can use the :hover on Bootstrap cards. To do so, use the following code:

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.card:hover {     
  cursor: pointer; 
  box-shadow:  0 8px 16px 0 rgba(0,0,0,0.2);
}

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<h1>This is a level 1 heading</h1>
<h2>This is a level 2 heading</h2>

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let randomNumber = Math.random();
console.log(randomNumber);

It is likely you have an issue with your application code. React (and other JavaScript-based frameworks) rely on being run in a single thread. If you create an infinite loop in a part of the code, or else specifically ask the code not to finish, the application can become stuck. You can also have issues with circular code dependencies. It is recommended to check the code for typical mistakes like syntax errors, or else log events in the application to help track down the source of the inconsistency.

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if (condition) {
  // code
} else {
  // code
}

The degree celsius symbol can be coded using HTML by using the ° code. Here is an example of the code used in a sentence:

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<p>The temperature was 5&deg;C.</p>

The output of this sentence would be: The temperature was 5°C.

To code degrees celsius, you can use a code block to define a function that converts Celsius to Fahrenheit. In Python 3, this function could look like this:

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def celsius_to_fahrenheit(celsius):
  fahrenheit = celsius * 9/5 + 32
  return fahrenheit

Declarative programming is a programming style that expresses the logic of a computation without describing its control flow. In JavaScript, a declarative example could be written as follows:

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const add = (x, y) => x + y;
let result = add(2, 3);
console.log(result); // 5

Imperative programming is a type of programming that focuses on specifying how a program should perform an action by giving step-by-step instructions. A simple example of imperative programming in JavaScript is creating a loop:

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for (let i = 0; i < 10; i++) {
  console.log(i);
}

This code loop tells JavaScript to start at 0, run the code inside the loop with the value of i starting at 0, until it reaches the condition where i is no longer less than 10, and increase the value of i by 1 after each iteration. The loop will output the numbers 0-9 to the console.

Font Awesome icons can be used easily on your website or application using HTML or CSS. You can find instructions on simple usage in HTML or CSS on Font Awesome's website. Basically, you can either use the HTML <i> tag with a CSS class, or the Unicode character. For example, the HTML and CSS for a UFO icon would be:

HTML:

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<i class="fas fa-ufo"></i>

CSS:

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.fa-ufo:before {
  content: "\f94e";
}

For a Java alert message, you could use the following code:

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JOptionPane.showMessageDialog(null, "Your desired message");

Yes, you can add a button to the footer of a webpage. You can use HTML and CSS elements to create the button, for example:

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<button type="button" class="footerButton">
  Click Me!
</button>

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.footerButton {
  background-color: #232f3e;
  border: none;
  color: white;
  padding: 10px 0px;
  text-align: center;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
}

@media is a CSS media query which enables you to create responsive designs that display differently depending on the size of the screen they are viewed on. For example, the code below will display a paragraph in blue if the screen's width is greater than 500px:

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@media (min-width: 500px) {
  p {
    color: blue;
  }
}

Yes, you can add a header inside a div using HTML.

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<div>
  <h1>Header</h1>
</div>

You could use a switch statement to allow the user to select one of the choices. For example, in JavaScript you would use the following syntax:

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let choice = prompt("Choose an option", "");
switch (choice) {
  case "option1":
    // Do something
    break;
  case "option2":
    // Do something else
    break;
  default:
    // Handle the error
    break;
}

You can use the following code to create a time range using if...else statements in JavaScript:

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var time = new Date().getHours();

if (time < 12) {
  console.log("Good Morning");
} else if (time >= 12 && time < 17) {
  console.log("Good Afternoon");
} else if (time >= 17 && time < 20) {
  console.log("Good Evening");
} else {
  console.log("Good Night");
}

In order to create a button to switch to dark mode, you will need to use javascript. An example of the code you can use is below:

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const darkMode = document.querySelector("#darkMode");
darkMode.addEventListener("click", () => {
    document.body.classList.toggle("darkmode");
});

Here is a link to a longer tutorial that goes into more detail: https://www.freecodecamp.org/news/how-to-implement-dark-mode-on-a-web-page-with-javascript/

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document.addEventListener("keydown", function(e) {
  if(e.keyCode === 32) {
    var randInt = Math.floor(Math.random() * Math.floor(10000));
    console.log(randInt);
  }
})

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span {
    display: block;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}