To console log multiple classes, you can use the document.getElementsByClassName() method in JavaScript. This method returns an HTML collection of elements with the specified class name. You can then loop over the collection and log each element to the console.

Here's an example of logging elements with the class name "example-class" to the console:

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const elements = document.getElementsByClassName("example-class");
for(let i = 0; i < elements.length; i++) {
  console.log(elements[i]);
}

This will log each element with the "example-class" to the console. You can replace "example-class" with the name of the class you want to log.

To use HTML classes, you first need to define a class in the HTML file or a separate CSS file. You can define a class with the class attribute followed by a name of your choice.

Here's an example of how to define a class in HTML:

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<style>
  .highlight {
    color: red;
    font-size: 18px;
    font-weight: bold;
  }
</style>

<p class="highlight">This paragraph will be highlighted!</p>

In the above example, we've defined a class called highlight and added some CSS styles to it. Then, we've applied that class to a p tag using the class attribute.

You can also apply multiple classes by separating class names with a space:

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<p class="highlight bold">This paragraph will be highlighted and bold!</p>

In this case, we've defined two classes (highlight and bold) and applied both of them to the p tag.

To apply the same class to multiple elements, you can use the same class name multiple times:

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<h1 class="heading">Welcome to my website</h1>
<p class="description">This is a website about coding</p>
<div class="box"></div>

<style>
  .heading {
    font-size: 32px;
    font-weight: bold;
  }

  .description {
    font-size: 16px;
    color: gray;
  }

  .box {
    width: 100px;
    height: 100px;
    background-color: blue;
  }
</style>

In this example, we've defined three classes (heading, description, and box) and applied them to different elements.

You can apply CSS to multiple classes by separating them with commas.

Example:

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.class1, .class2 {
  background-color: blue;
  color: white;
}

This example applies a background-color of blue and a color of white to both .class1 and .class2.

You can use the CSS class selector to style an element with multiple classes. The class selector is denoted by a period . followed by the class name.

For example, given the following HTML:

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<div class="block red color-1">
</div>

You can use CSS to style the element like this:

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.block {
  background-color: yellow;
}
.red {
  color: red;
}
.color-1 {
  color: blue;
}

This would render the HTML element with a yellow background, red text and blue text (overriding the style set by the red class).

In order to use multiple classes, you need to separate the classes using a space between them. For example:

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<div class="class1 class2">
</div>

Therefore, the following code should work based on the classes defined in your stylesheet:

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<div class="primary-button big-button">
</div>