To learn how to use the syntax of the id selector, you need specific code examples
When learning CSS (cascading style sheets), understand and master the syntax and use of the selector Method is very important. Among them, the id selector is a commonly used selector that allows us to select specific elements and apply styles to them by adding the id attribute to HTML elements.
First, let us understand the syntax of the id selector. In CSS, when using the id selector, you need to add the pound sign "#" in front of the selector, followed by the id name. For example, if our HTML element sets the id attribute to "my-element", then the corresponding CSS selector is "#my-element".
Next, we use some specific code examples to demonstrate the use of the id selector.
HTML代码：
<!DOCTYPE html>
<html>
<head>
<style>
/* 使用id选择器设置特定元素的样式 */
#my-element {
color: red;
font-weight: bold;
}
</style>
</head>
<body>
<div id="my-element">
这是一个特定元素
</div>
<p>
这是普通文本。
</p>
</body>
</html>In the above code, we defined an id selector #my-element within the <style></style> tag, and set some style attributes ( If the color is red, the font will be bold). Next, within the tag, we pass the <div> element and set the id attribute to "my-element". In this way, the element is selected and the style we defined is applied. <p>It is worth noting that the id selector is a unique selector, that is, the id attribute in each HTML document should be unique. If multiple elements have the same id, only the first element will be styled, and subsequent ones will be ignored. </p>
<p>In addition to using the id selector directly in CSS code, we can also dynamically change the style of elements through scripting languages such as JavaScript. Below is a simple JavaScript example demonstrating how to use the id selector. </p><pre class='brush:php;toolbar:false;'>JavaScript代码：
var myElement = document.getElementById("my-element");
myElement.style.backgroundColor = "yellow";</pre><p>In the above code, we use JavaScript's <code>getElementById method to get a specific element by passing in the id name. We can then dynamically change the background color of that element to yellow by setting the style.backgroundColor property.
To sum up, learning the syntax and usage of the id selector is an important step in getting started with CSS. By adding id attributes to HTML elements and using id selectors for style settings, we can precisely control specific elements to meet our web page style requirements. At the same time, we can also use scripting languages such as JavaScript to dynamically change the style of elements to increase the interactivity and dynamics of the page.
The above is the detailed content of Master the syntax of id selector. For more information, please follow other related articles on the PHP Chinese website!
'CSS4' UpdateApr 11, 2025 pm 12:05 PMSince I first chimed in on the CSS4¹ thing, there's been tons of more discussion on it. I'm going to round up my favorite thoughts from others here. There is
The Three Types of CodeApr 11, 2025 pm 12:02 PMEvery time I start a new project, I organize the code I’m looking at into three types, or categories if you like. And I think these types can be applied to
HTTPS is Easy!Apr 11, 2025 am 11:51 AMI've been guilty of publicly bemoaning the complexity of HTTPS. In the past, I've purchased SSL certificates from third-party vendors and had trouble
HTML Data Attributes GuideApr 11, 2025 am 11:50 AMEverything you ever wanted to know about data attributes in HTML, CSS, and JavaScript.
Understanding Immutability in JavaScriptApr 11, 2025 am 11:47 AMIf you haven’t worked with immutability in JavaScript before, you might find it easy to confuse it with assigning a variable to a new value, or reassignment.
Custom Styling Form Inputs With Modern CSS FeaturesApr 11, 2025 am 11:45 AMIt’s entirely possible to build custom checkboxes, radio buttons, and toggle switches these days, while staying semantic and accessible. We don’t even need a
Footnote CharactersApr 11, 2025 am 11:34 AMThere are special superset number characters that are sometimes perfect for footnotes. Here they are:
How to Create an Animated Countdown Timer With HTML, CSS and JavaScriptApr 11, 2025 am 11:29 AMHave you ever needed a countdown timer on a project? For something like that, it might be natural to reach for a plugin, but it’s actually a lot more
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
SublimeText3 Mac version
God-level code editing software (SublimeText3)
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
Notepad++7.3.1
Easy-to-use and free code editor
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
