HTML (HyperText Markup Language) is the foundation of every website and web application—including Lightning Web Components (LWC). Before learning LWC, it is essential to understand how HTML works because LWC uses HTML templates to design layouts, UI, and component structure.
What is HTML?
HTML is a markup language used to create the structure of web pages. It tells the browser what elements to display—such as text, images, buttons, forms, links, etc.
HTML is made up of:
- Elements
- Tags
- Attributes
- Nested structures
<h1>Hello Peoplewoo Skills</h1> <p>Welcome to HTML for LWC!</p> Watch Our Video Tutorial
Why HTML Is Important for LWC
LWC uses HTML to define the UI. Everything you see on an LWC page—labels, layouts, buttons, forms—is built using an HTML template.
In LWC:
- Each component has a .html template file
- HTML tags are used to display data
- HTML attributes help link JS and LWC features
- Conditional rendering uses HTML directives
- Loops render lists through template syntax
<template> <h1>{greeting}</h1> <button>Click Me</button> </template>
Basic Structure of an HTML Document
<!DOCTYPE html> <html> <head> <title>My First Page</title> </head> <body> <h1>Hello World!</h1> </body> </html> This structure is similar to how LWC templates are built (without <html>, <head>, <body> tags).
HTML Tags Every LWC Developer Should Know
1. Heading Tags (<h1> to <h6>)
<h1>Main Heading</h1> <h2>Sub Heading</h2> 2. Paragraph Tag
<p>This is a paragraph.</p>
3. Anchor Tag (Links)
<a href="https://peoplewooskills.com">Visit Us</a>
4. Image Tag
<img src="logo.png" alt="Peoplewoo Skills Logo">
5. Button Tag
<button>Click Me</button>
6. Div & Span
<div>Block element</div> <span>Inline text</span>
Lists in HTML
Ordered List
<ol> <li>HTML</li> <li>CSS</li> </ol>
Unordered List
<ul> <li>Salesforce</li> <li>LWC</li> </ul>
HTML Attributes
Attributes provide extra information to elements.
<img src="image.jpg" width="200" height="200">
Common Attributes
idclassstylesrchref
Forms in HTML
Forms are important in LWC for handling user input.
<form> <label>Name:</label> <input type="text" name="username"> <button type="submit">Submit</button> </form>
HTML Tables
<table border="1"> <tr> <th>Name</th> <th>Age</th> </tr> <tr> <td>Amit</td> <td>25</td> </tr> </table>
Semantic HTML (Very Important for LWC)
Semantic tags make HTML meaningful and help with SEO and accessibility.
Common Semantic Tags
- <header>
- <nav>
- <section>
- <article>
- <footer>
HTML in LWC Templates
LWC templates use HTML with Salesforce-specific enhancements.
Interpolation (Displaying JS data)
<p>Welcome, {userName}</p>
Conditional Rendering
<template if:true={isVisible}> <p>This is visible</p> </template>
Loop Rendering
<template for:each={students} for:item="stu"> <p key="{stu.id}">{stu.name}</p> </template> Best Practices for HTML in LWC
- Use semantic HTML for clean structure
- Always use
keyattribute inside loops - Do not use inline JavaScript inside HTML
- Use
classfor styling with CSS, not inline styles - Keep HTML simple and accessible
Common Mistakes to Avoid
- Not closing tags properly
- Using outdated tags like <center>
- Mixing CSS and JS inside HTML
- Missing alt text for images
- Incorrect nesting of elements
Frequently Asked Questions (FAQ)
Conclusion
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