To adjust the line height in CSS, you can use the line-height property. You can set this property for a particular element or for the entire page.

Here is an example of how to set the line-height property to a specific value (in this case, 1.5):

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p {
  line-height: 1.5;
}

This sets the line-height of all paragraph elements to 1.5 times the font-size. You can adjust the value to your liking.

You can also set the line-height to a specific pixel value:

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p {
  line-height: 24px;
}

This sets the line-height of all paragraph elements to 24 pixels.

You can learn more about the line-height property in CSS here: https://www.w3schools.com/cssref/pr_dim_line-height.asp

box-shadow is a CSS property that adds a shadow effect to an HTML element, such as a box. It takes in a set of values to set the size, spread, color, and position of the shadow. Here’s an example in CSS:

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div {
  box-shadow: 2px 2px 5px black;
}

This will create a black shadow around the div element with a horizontal offset of 2 pixels, a vertical offset of 2 pixels, a blur of 5 pixels, and without a spread radius. You can learn more about box-shadow here: https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow

To add a property to an object in JavaScript, you can use either dot notation or bracket notation.

Here's an example using dot notation:

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const myObj = {};
myObj.color = 'blue';

In the above example, we first create an empty object called myObj. Then, we add a color property to it using dot notation by simply writing myObj.color and assigning it a value of 'blue'.

Here's an example using bracket notation:

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const myObj = {};
myObj['color'] = 'blue';

In this example, we're doing the exact same thing as the previous example, but using bracket notation instead of dot notation. In this case, we're using the string 'color' as the key inside the square brackets to add the color property to myObj.

Here's the MDN documentation on objects in JavaScript: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Basics

Infinity is a property in JavaScript that represents the mathematical infinity value. It is a globally defined variable that represents a numeric value greater than any other number. Here's an example:

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console.log(Infinity); // Output: Infinity
console.log(10/0); // Output: Infinity
console.log(-10/0); // Output: -Infinity

To add a shadow to a button, you can use CSS (Cascading Style Sheets) box-shadow property. Here's an example of how you could add a shadow to a button element with an ID of "myButton" using CSS:

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#myButton {
  box-shadow: 2px 2px 5px black;
}

In this example, the "box-shadow" property consists of three length values and a color value. The first two length values represent the horizontal and vertical offsets of the shadow, and the third value represents the blur radius of the shadow. The color value is the color of the shadow. So in the above example, a 2-pixel horizontal offset, a 2-pixel vertical offset, a 5-pixel blur radius, and a black color are specified. You can adjust these values to create the desired shadow effect.

unicode-bidi is a CSS property that specifies the level of embedding of an element's text in the bidirectional text algorithm. It is used for controlling the direction or handling of text containing both left-to-right and right-to-left text. This property can take values like normal, embed, isolate, and bidi-override.

Here's an example of using unicode-bidi in CSS:

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p {
  unicode-bidi: bidi-override;
}

You can learn more about unicode-bidi here.

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

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p {
  text-decoration: underline;
}

In this example, the text-decoration property is applied to all paragraphs (p element) and underlines them. You can also apply the same property to other HTML elements like headings or links.

To use overflow in CSS, you can specify the overflow property in your CSS code.

The overflow property specifies what should happen if content overflows an element's box.

Here's an example of using overflow in CSS:

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.container {
  width: 200px;
  height: 200px;
  overflow: scroll;  /* creates a scrollbar if content overflows */
}

In this example, the overflow property is set to scroll. This means that if the content in the container overflows, it will create a scrollbar so that the user can scroll through it.

Here's a list of other values for the overflow property:

• visible: Default value. Content is not clipped, it may be rendered outside the content box.
• hidden: Content that overflows the element's box is hidden.
• scroll: Content that overflows the element's box is clipped and a scrollbar is added to see the rest of the content.
• auto: Similar to 'scroll', but only adds a scrollbar when necessary.

You can learn more about the overflow property in CSS in the following link: https://developer.mozilla.org/en-US/docs/Web/CSS/overflow

CSS provides various transition effects for elements. Some of the transition properties in CSS are as follows:

• transition-property: Specifies the CSS property or properties to transition.
• transition-duration: Specifies the duration of the transition effect.
• transition-timing-function: Specifies the speed curve of the transition.
• transition-delay: Defines a delay (in seconds) for the transition effect.

For example, a CSS transition that changes the background-color of a div element over a duration of 2 seconds with a linear timing function can be written as follows:

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div {
  background-color: red;
  transition-property: background-color;
  transition-duration: 2s;
  transition-timing-function: linear;
}

You can learn more about CSS transitions at CSS Transitions - CSS | MDN.

position: relative in CSS is a positioning property which positions an element relative to its normal position.

When you set position: relative on an element, it moves the element's position from its normal position based on the top, right, bottom, and left values that you set for it.

The original space taken up by the element remains reserved, so the surrounding elements are unaffected.

An example of how to use position: relative in CSS would be:

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.box {
  position: relative;
  top: 20px;
  left: 50px;
}

This code moves the element with the class .box 20 pixels down and 50 pixels right from its original position.

Here's a link to the Mozilla Developer Network documentation on position which includes more information and usage examples.

background is a shorthand property that allows you to set all the background properties (including the background-color) in one line.

On the other hand, background-color property sets the color of the background of an element.

Here's an example to set the background property with its sub-properties:

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.element {
  background: #f9f9f9 url(background-image.jpg) repeat-y right top;
}

And here's an example to set only the background-color property:

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.element {
  background-color: #f9f9f9;
}

You can learn more about CSS background property here.

To add a shadow to text, you can use the CSS text-shadow property.

Here’s an example of how to add a black shadow of size 2px horizontally and vertically on white text:

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    /* css */
    h1 {
      text-shadow: 2px 2px 2px black;
    }

The text-shadow property takes three values:

• The first value is the horizontal offset of the shadow. A positive value will move the shadow to the right, while a negative value will move the shadow to the left.
• The second value is the vertical offset of the shadow. A positive value will move the shadow down, while a negative value will move the shadow up.
• The third value is the blur radius of the shadow. A higher value will create a more blurred shadow, while a lower value will create a sharper shadow.

You can adjust these values to create different effects for your text. Here's a link to a CodePen example where you can see the effect in action: https://codepen.io/netiquette/pen/RwWJoRM

To add a property to an object in JavaScript separately, you can access the object and use the dot notation or bracket notation. Here is an example using the dot notation:

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let person = {
  name: 'John',
  age: 30
};

person.address = '123 Main St';
console.log(person); 

// Output: { name: 'John', age: 30, address: '123 Main St' }

In this example, we create an object called person with properties name and age. To add a separate address property, we can access the person object and add the new property using the dot notation (person.address) and assign a value to it ('123 Main St'). We then log the person object to the console to see the result.

You can also use the bracket notation to add a property to an object. Here is an example:

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let person = {
  name: 'John',
  age: 30
};

person['address'] = '123 Main St';
console.log(person); 

// Output: { name: 'John', age: 30, address: '123 Main St' }

In this example, we use the bracket notation (person['address']) to add the address property to the person object. We assign the value '123 Main St' to the property using the same syntax.