You can use HTML along with CSS to achieve this. Here's an example code snippet using HTML and CSS:

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<h1>
  First Line Text <br />
  <span>Second Line Text</span>
</h1>

<style>
  h1 span {
    color: red;
  }

  h1 {
    color: blue;
  }
</style>

In this code, we have used the br tag to break the h1 heading into two lines. Then, we have nested the second line of text within a span tag, so that we can apply a different color to it using CSS.

Inside the style tags, we have targeted the span tag inside the h1 using the h1 span selector, and applied red color to it. Then, we have targeted the h1 tag and applied blue color to it.

You can replace the text and colors in this code with your desired text and colors.

To do a query selector for the same h1, you can use the querySelectorAll() method and pass it the h1 tag as the parameter. Then, you can use a loop to go through each h1 element in the NodeList result and create a prompt for each one. Here's an example in JavaScript:

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const headings = document.querySelectorAll("h1");

for(let i = 0; i < headings.length; i++) {
  const userInput = prompt(`Enter something for ${headings[i].textContent}`);
  headings[i].textContent = userInput; // update the heading with the user input
}

This code selects all the h1 elements in the document and loops through each one. For each h1 element, it creates a prompt that asks the user to enter something for that heading, and then updates the heading with the user's input.

Note that if you have more than one h1 element in the document, this code will prompt the user multiple times.

To make different sizes of text within one h1 element, you can use HTML and CSS to style each text segment separately. One way to do this is by using span elements and CSS font-size property.

Here's an example code snippet:

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<h1>
  <span class="large">Large text</span>
  <span class="medium">Medium text</span>
  <span class="small">Small text</span>
</h1>

<style>
  .large {
    font-size: 32px;
  }

  .medium {
    font-size: 24px;
  }

  .small {
    font-size: 16px;
  }
</style>

In this example, we have a h1 element with three span elements inside, each containing different text. The class attribute is used to apply different font sizes to each span element. CSS rules for each class specify the font-size property with different pixel values, creating the desired effect of varying text sizes within the h1 element.

Note that you can adjust the font-size values to fit your desired style.

To underline h1 in CSS, you can use the text-decoration property with the value underline. Here's an example code block in CSS:

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h1 {
  text-decoration: underline;
}

This will underline all h1 elements on the page. If you only want to underline a specific h1, you can give it a class or ID and target it like this:

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h1.special {
  text-decoration: underline;
}

In this example, only the h1 element with the class "special" will be underlined.

To change the color of h1 and h2 headings in HTML/CSS, you can use the following CSS code:

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h1 {
  color: red; /* or any other color you want */
}

h2 {
  color: blue; /* or any other color you want */
}

You can replace red and blue with any valid color value such as hexadecimal codes, RGB, RGBA, HSL, or HSLA. Here is an example using hexadecimal codes:

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h1 {
  color: #ff0000; /* red */
}

h2 {
  color: #0000ff; /* blue */
}

For more information on CSS and how to style HTML elements, you can check out this documentation: https://www.w3schools.com/css/

To change your H1 font style, you can use CSS (Cascading Style Sheets) and set the font-style property for the H1 element in your HTML code. Here's an example:

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h1 {
  font-style: italic;
}

In this example, the font-style property is set to italic. You can replace "italic" with other values such as "normal" or "oblique" to achieve different font styles.

If you want to change the font family, size, or color as well, you can use other CSS properties such as font-family, font-size, and color. Here's an example that changes the font family, size, color, and style:

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h1 {
  font-family: Arial, sans-serif;
  font-size: 24px;
  color: #333333;
  font-style: normal;
}

In this example, the font family is set to Arial or a generic sans-serif font, the font size is 24 pixels, the color is dark gray (#333333), and the font style is normal. You can adjust these values to suit your preferences.

To make a border around an h1 element, you can use CSS. Here's an example code using basic CSS:

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h1 {
  border: 1px solid black;
}

This will add a border of 1px thickness with a solid style and black color around your h1 element. You can customize the border width, style, and color to your preferences.

Here's a link to learn more about CSS borders and how to customize them: CSS Border

To underline the h1 heading in CSS, you can use the text-decoration property and set its value to underline. Here is an example code block using CSS:

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h1 {
  text-decoration: underline;
}

This sets an underline on all h1 elements in your HTML document. You can customize the style further by adjusting the text-decoration property, such as the color of the underline. Here is a MDN Web Docs reference on the text-decoration property: https://developer.mozilla.org/en-US/docs/Web/CSS/text-decoration

To underline an h1 tag in CSS, you can use the text-decoration property and set it to underline. Here's an example code block in CSS:

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h1 {
  text-decoration: underline;
}

This will underline all h1 tags in your HTML document. You can also apply this style to a specific h1 tag by targeting it with its ID or class, like this:

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#myHeader {
  text-decoration: underline;
}

In this example, the text-decoration: underline style will only apply to the h1 tag with an ID of myHeader.

To make the h1 font-weight thin, you can use CSS. Here's an example code block in CSS:

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h1 {
  font-weight: 100;
}

By setting the font-weight property to a lower value, like 100, the font will appear thinner. You can adjust the value between 100 to 900 to achieve your desired thickness.

Note that not all font families support thin font-weights, so you may need to experiment with different font-families as well.

To create a line break within h1.innerHTML, you can use the HTML line break tag <br>. This tag creates a new line wherever it is placed. Here's an example code snippet in JavaScript:

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let myHeading = document.querySelector('h1');
myHeading.innerHTML = 'Hello <br> World!';

In this example, the h1 element's innerHTML property is set to 'Hello <br> World!', which will display "Hello" on one line and "World!" on the next line within the heading element.

To underline an h1 heading in HTML, you can use the 'text-decoration' property in CSS and set it to 'underline'.

Here is an example of how to do this:

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<!DOCTYPE html>
<html>
  <head>
    <title>Underline h1 Heading</title>
    <style>
      h1 {
        text-decoration: underline;
      }
    </style>
  </head>
  <body>
    <h1>This is an underlined heading</h1>
  </body>
</html>

In this example, we have defined a CSS style for h1 using the 'text-decoration' property, which sets the text decoration to 'underline'. This style is then applied to the h1 element in the HTML using the 'class' attribute.

To change the content of an h1 tag based on if else statements, you can use JavaScript to select the h1 element and change its innerHTML property.

Here's an example code snippet in JavaScript:

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let h1 = document.querySelector("h1");

if (condition) {
  h1.innerHTML = "New heading text if condition is true";
} else {
  h1.innerHTML = "New heading text if condition is false";
}

Replace "condition" with the condition you want to check (e.g., a Boolean variable or a comparison), and replace the strings in the innerHTML assignments with the text you want to display in the h1 tag.

Note that you'll first need to select the h1 element using a DOM method like querySelector.

To target the CSS of an h1 that is inside a Bootstrap col, you can use a combination of classes to form a more specific CSS selector. Here's an example:

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.col h1 {
  /* Your CSS code here */
}

The above code will target any h1 element that is inside a Bootstrap col class. The space between .col and h1 indicates that the h1 is a descendant of an element with the class of col.

Remember to replace the /* Your CSS code here */ comment with your actual CSS code.

Here's an example code snippet that targets the h1 element with red font color:

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.col h1 {
  color: red;
}

To add a header element in HTML, you can use the

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<header>
  <h1>This is a header element</h1>
</header>

This code will add a header element with a level 1 heading inside it. You can also use other heading levels, such as h2 or h3, depending on the importance of the text within the header element. Here is the link to the documentation for the header tag: MDN documentation for header tag

To underline an h1 heading, you can use the text-decoration property in CSS and set its value to underline. Here's an example:

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h1 {
  text-decoration: underline;
}

This will apply an underline to all h1 headings on your web page.

HTML

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<!DOCTYPE html>
<html>
  <head>
    <title>My Landing Page</title>
  </head>
  <body>
    <h1>My Landing Page</h1>
  </body>
</html>

CSS

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h1 {
  color: red;
  text-align: center;
  font-size: 24px;
} 

JavaScript

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// No script needed for this example 

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const button = document.querySelector("#apply");

button.addEventListener("click", event => {
  const name = prompt("What is your first name?");
  const age = prompt("How old are you?");
  const h1 = document.querySelector("h1");

  if (parseInt(age) >= 18) {
    h1.textContent = `Hi, ${name}! Welcome to SheCodes !`;
  } else {
    h1.textContent = `Sorry, ${name}! You cannot join SheCodes `;
  }
});

You can add a underline to an <h1> tag by using the following CSS:

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h1 {
  text-decoration: underline;
}

For more information, see MDN's guide to text-decoration.

To underline

with css, you can use the text-decoration property.

Example:

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h1 {
  text-decoration: underline;
}

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h1 {
    font-weight: thin;
}

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h1 {
  text-decoration: underline;
}

In HTML, the <h1> tag represents the Heading 1 element, the most important heading. It is used to designate the primary title or heading of a page or section. For more information, you can refer to this resource.

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

Using CSS, you can make a H1 font weight thin using the following code:

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h1 {
   font-weight: 200;
}