Why Should Unprefixed CSS Declarations Be Placed Last in Vendor-Specific Property Ordering?

Optimal Ordering of Vendor-Specific CSS Declarations

In the realm of web development, it's not uncommon to encounter situations where vendor-specific CSS declarations are employed to ensure cross-browser compatibility. While the order of these declarations may seem arbitrary, it's crucial to consider their sequencing for optimal performance and future-proofing.

The recommended best practice for ordering vendor-specific CSS declarations is to place the unprefixed property last. This approach ensures that the W3C implementation of the property, if supported, will be applied.

.foo {
    -moz-border-radius: 10px;    /* Mozilla */
    -webkit-border-radius: 10px; /* Webkit */
    border-radius: 10px;         /* W3C */
}

By placing the unprefixed property last, the W3C implementation (border-radius) will be used when available. This helps maintain consistency across browsers that support it and ensures alignment with the latest standards.

It's important to note that the experimental property (-webkit-border-radius, for example) may contain deviations from the specification. In contrast, the W3C implementation (border-radius) adheres strictly to the standard. Therefore, prioritizing the W3C implementation guarantees conformance and minimizes potential issues.

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