CSS border-top-left-radius
The CSS border-top-left-radius property is used when adding rounded corners to your borders. This property allows you to set the border radius on the top-left corner.
Note that the border-top-left-radius property needs to be used in conjunction with the border property (or another border-related property) in order to set the actual border.
See border-radius for a shorthand method for setting the border radius across all four sides at once.
The examples on this page include browser-specific properties that start with extensions such as -webkit-, -moz-, etc. This is for browser compatibility reasons. See the bottom of this article for more on this.
| Syntax: |
border-top-left-radius: radius
Or: border-top-left-radius: horizontal-radius vertical-radius
See "Possible Values" below for a more detailed explanation of the accepted values. |
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| Example |
Note that this example includes various CSS extensions in addition to the W3C CSS3 property. This is for browser compatibility.
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| Try it yourself! |
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| Possible Values: |
Values/SyntaxThe possible values for this property are: [ <length> | <percentage> ]{1,2}
Explanation of the Values
Explanation of the SyntaxYou can provide either one or two values:
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| Initial Value: | 0
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| Applies to: | All elements |
| Inherited: | No |
| Media: | Visual |
Browser Compatibility
At the time of writing, CSS3 was still under development and browser support for many CSS3 properties was limited or non-existent. For maximum browser compatibility many web developers add browser-specific properties by using extensions such as -webkit- for Safari and Google Chrome, -ms- for Internet Explorer, -moz- for Firefox, -o- for Opera etc. As with any CSS property, if a browser doesn't support a proprietary extension, it will simply ignore it.
This practice is not recommended by the W3C, however in many cases, the only way you can test a property is to include the CSS extension that is compatible with your browser.
Be aware that if you choose to use the proprietary CSS extensions in a live environment, your code will not pass any W3C CSS validation, as the browser-specific properties are not valid W3C properties.
Many of the CSS3 examples on this website include these browser specific properties. If they weren't included, most of the examples wouldn't work for most users (at least, not until possibly years after the article was written).
The major browser manufacturers are working to support the W3C properties, and eventually, you will be able to omit these browser-specific properties.