1. **Use CSS Resets or Normalize.css**
- Reset CSS removes default styling, while Normalize.css makes elements consistent across browsers.
- Example:
```css
* { margin: 0; padding: 0; box-sizing: border-box; }
```
2. **Prefix Vendor-Specific Properties**
- Use tools like Autoprefixer to add vendor prefixes (`-webkit-`, `-moz-`, `-ms-`, `-o-`) for experimental features.
- Example:
```css
.box {
-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;
}
```
3. **Feature Detection with @supports**
- Check if a CSS feature is supported before applying it.
- Example:
```css
@supports (display: grid) {
.container { display: grid; }
}
```
4. **Use Modern Layout Techniques (Flexbox/Grid)**
- Flexbox and Grid are widely supported but test fallbacks for older browsers.
5. **Avoid Cutting-Edge Features Unnecessarily**
- Check compatibility on [Can I Use](https://caniuse.com) before using new CSS properties.
6. **Test on Multiple Browsers & Devices**
- Use tools like BrowserStack, CrossBrowserTesting, or manual testing.
7. **Polyfills for Missing Features**
- Use JavaScript polyfills (e.g., `css-vars-ponyfill` for CSS variables in IE).
8. **Progressive Enhancement**
- Design for basic browsers first, then enhance for modern ones.
9. **Validate CSS**
- Use the [W3C CSS Validator](https://jigsaw.w3.org/css-validator/) to catch syntax errors.
10. **Fallbacks for Unsupported Properties**
- Provide alternative styling for older browsers.
- Example:
```css
.box {
background: #f00; /* Fallback */
background: rgba(255, 0, 0, 0.5);
}
```
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