lesson1Title

lesson2Title

lesson3Title

lesson4Title

lesson5Title

lesson6Title

lesson7Title

lesson8Title

lesson9Title

lesson10Title

webIntroHtmlChapter3Title

lesson11Title

lesson12Title

webIntroHtmlChapter1Title

webIntroHtmlChapter2Title

webIntroHtmlChapter4Title

# ID Selector

An HTML `id` is a unique `selector` used to identify a specific HTML element.

The id is primarily used to assign a `unique id` to a specific element, allowing it to be selected and manipulated with CSS or JavaScript.

Due to this uniqueness, multiple HTML elements cannot share the same id.

The `id` selector is defined with a `#` as shown below.

```html title="Example of Using HTML id"
<style>
  #intro {
    font-size: 24px;
    font-weight: bold;
    color: green;
  }
</style>

<p id="intro">Welcome</p>
```

The code above selects an HTML element with the id `intro` using `#intro`, applying styles that are only applicable to this HTML element.

Note that ids are case-sensitive. For example, `Intro` and `intro` are considered different ids.

However, ids are conventionally written in `lowercase`.

In HTML, an id is an identifier that can uniquely identify a specific element. This identifier allows you to select and manipulate the element in CSS or JavaScript.

### What is the most appropriate answer to fill in the blank?