A pseudo-element in CSS is used to style content that is not part of the document tree, but generated by the browser in the document tree. Common pseudo-elements include ::before and ::after, which allow you to add content before and/or after an element's content. For example, you could use the ::before pseudo-element to add an icon before a link. To learn more about pseudo-elements, see: https://developer.mozilla.org/en-US/docs/Web/CSS/Pseudo-elements.

<span> is an HTML tag that is used to group inline-elements and apply styles to them. It has no other semantic meaning and does not affect the document layout. For example, you can enclose a word in a <span> element and apply a style to it to make the word bold, change its color etc. Here is an example:

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<span style="color:red; font-weight: bold;">This text is in red and bold.</span>

Yes, you can style the hr (horizontal ruler) element using CSS. Here is an example code:

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hr { 
  border: none; 
  border-top: 1px solid #000; 
}

To use box shadow in CSS you must specify values for the box-shadow property. The syntax for the box-shadow property is:

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box-shadow: [horizontal offset] [vertical offset] [blur radius] [optional spread radius] [color];

More details and examples can be found on the MDN docs.

Underlines on links can be enabled or disabled by CSS styles. Depending on the browser, the exact command used may vary, but a typical command to enable the underline is text-decoration: underline. You can add or remove this in the CSS stylesheet or style tag of the webpage.

In HTML, to remove the underline from a link, you can use the <style> tag with the text-decoration property set to none:

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<style>
  a {
  text-decoration: none;
  }
</style>

This can happen when the JS code is manipulating the style of the HTML element, causing it to not be visible. If you have an inline style, it could be getting overridden with display: none, which would make the element invisible. Check the style of the element in the developer tools to get an idea of what is causing the issue, and investigate the JS code to find why it's overriding the styles.

To change the look of a button in CSS, you need to modify the CSS class of the button. You can modify the font size, background color, border style, border radius, etc. For example, if you want to make the font size of a button to be 14px and change its background to yellow, use the following code:

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.button {
    font-size: 14px;
    background-color: yellow;
}

You can use the background CSS property to specify color, image and other background styles. In its most basic usage, you can set the background color like this:

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body {
    background: #9e9ea0;
}

More information can be found on the Mozilla Developer Network website here.

In HTML, you can create columns using the <div> element, setting the widths of each column with the style attribute and the width property. Additionally, you can use the display property and specify a value of flex, inline-flex, or grid. Here is an example of creating two columns with the flex display property:

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<div style="display: flex;">

    <div style="flex: 1;">
        First column content goes here
    </div>

    <div style="flex: 1;">
        Second column content goes here
    </div>

</div>

Additionally, if you are looking for a more accessible and semantic approach to creating columns, you can use <table>, <thead>, and <tbody> elements with the colspan attribute. For more information on creating tables in HTML, you can read this article from w3schools.

Typically, there are two criteria for when to use an id attribute instead of a class attribute.

1. When the element appears only once on the page: An id attribute should be used when an element only appears once on the page. This makes it easier to refer to the element when writing CSS or JavaScript code.

2. When the element requires a unique style: If your page includes multiple elements that have a similar style but require some subtle differences (for example, different font size, color, etc.), you can use an id to apply a unique style to the element.

For more detailed information about when to use an id attribute instead of a class attribute, check out this guide from w3schools: https://www.w3schools.com/css/css_id_class.asp

CSS attributes are features that define the style and behavior of HTML elements. Attributes can be applied to nearly any HTML tag and tell the browser how to display the element, such as font color, background color, size, position and many more.

For example, you could set the font-size of a heading element to be 32px like this:

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h1 {
  font-size: 32px;
}

To add a style to a <li> element without interfering with the styling of an <h1> element, you can use the div selector. With the div selector, you can specify what styling to apply to the <li> elements without conflicting with the <h1>.

For example in CSS, you can use the following code:

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div .list-item {
  color: #ff0000; 
}

This will add styling to any <li> elements that are a child of a <div>. Here, color: #ff0000; makes all the text in the <li> element red.

More information about the div selector can be found in this guide.

CSS stands for Cascading Style Sheets. It is a style language used to describe the presentation of HTML documents. CSS provides HTML elements with various style attributes such as fonts, colors, column and box dimensions, borders, background images, and other style effects. It is used to create websites and web applications. For more information, see this tutorial on CSS.

On an HTML page, you can use CSS to change the style of a link when it's hovered over. To do this, you can use the :hover CSS selector. For example, if you want the color of the link to change to green when the user hovers over it, you can insert the following code into your CSS file:

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a:hover {
  color: green;
}

More information about the :hover selector can be found on the Mozilla Developer Network: MDN - :hover

You can use the CSS border property to add a border to images. The border property takes the following syntax:

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img { 
  border: <width> <style> <color>;
}

The width value determines the thickness of the border. Common values are 1px or 2px.

The style value determines the type of border. Common values are solid, dotted, dashed or double.

The color value determines the color of the border. This can be a hexadecimal color code, an RGB color code or one of the standard colors (e.g. black).

For more information on the border property, refer to the Mozilla Developer Network Web Documentation.

Example:

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img { 
  border: 2px dashed orange;
}

If you want to place an image and some text on the same line on an HTML page, you can use the <p> tag with the style attribute set to display:inline-block.

For example:

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<p style="display:inline-block;">
  <img src="img/example.png">
  Some text
</p>

This will display the image and text on the same line.

For further reading, take a look at this tutorial on how to align images side by side.

Using CSS, you can style links in a div using the a selector. For example:

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div a {
  color: #000;
  font-weight: bold;
}

This will set the text color to black and bold the font weight of all links within the div.

More information on styling links: MDN CSS a Selector

Yes, you can add multiple classes to a HTML element by separating them with spaces. For example:

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<p class="class1 class2 class3">My paragraph</p>

Reference: https://www.w3schools.com/html/html_classes.asp

You can use the <ul> list element in HTML along with the style attribute and a background-color value to make bullet points with different colors. Here is an example:

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<ul>
  <li style="background-color: #e6e6e6">Bullet 1</li>
  <li style="background-color: #FFCCCC">Bullet 2</li>
  <li style="background-color: #CCFFCC">Bullet 3</li>
</ul>

This will produce a list like this:

• Bullet 1
• Bullet 2
• Bullet 3

More information on the <ul> list element and the style element can be found on the Mozilla Developer Network website.

In HTML and CSS, you can underline text on hover with the following code:

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a:hover {
  text-decoration: underline;
}

You'll need to wrap this code in a style tag. For example:

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<style> 
  a:hover {
    text-decoration: underline;
  }
</style>

For more information, you can refer to the CSS Hover Activity guide.

The transition property in CSS is used to animate changes from one CSS style to another. The transition-property specifies what property is being transitioned, such as width, height, opacity, etc. To apply a pointer during the transition, you can include the transition-timing-function: pointer attribute in the transition property. For example:

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div {
  width: 100px;
  transition: width 0.5s linear, transition-timing-function: pointer;
}
div:hover {
  width: 500px;
}

In this example, the transition property indicates that when the div element is hovered on, the width of the element will transition from 100px to 500px in 0.5 second, with a linear pointer.

Reference: MDN docs - transition

In HTML, the <a> element (short for "anchor") defines a link. In order to remove the underline from the link's text, you need to include the text-decoration property set to none within its style attribute.

For example:

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<a href="example.com" style="text-decoration:none;">This link will not be underlined!</a>

For more information, see this Codecademy article.

Adding a border to HTML elements can be done using the CSS border property. Here is an example:

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div {
    border: 5px solid black;
}

The border property takes the format border: [width] [style] [color]. The width (5px in this example) determines the thickness of the border, the style (solid) determines the type of border (solid, dotted, etc.), and the color (black) determines the color of the border.

For more detailed usage, please refer to this documentation by W3Schools: https://www.w3schools.com/css/css_border.asp.

In HTML, using the <div> tag, you can use the style attribute to center an element. To center a <div> element, use the following CSS:

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div {
  margin: 0 auto;
  width: 50%;
}

In the example above, the div's margins will be set to 0 auto, and the width will be set to 50%. More information on centering with CSS can be found here.