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W3C CSS Validator shows 153 errors & warnings



I have published my website and when i look at the W3C CSS Validator it shows 153 errors & warnings. How do i fix such errors & warnings?


Browser vendors sometimes add prefixes to experimental or nonstandard CSS properties and JavaScript APIs moz

Webflow CSS output is very clean/minimal/valid. All of your errors are beacuse of Vendor_Prefix
like: -moz-transform. This is not wrong but the vendors related to Browser (Like Chrome, Firefox) and not included in CSS spec.

Example. Today if you want to be in the “safe side” - for flex - this code:

div {
    display: flex;

Should be:

div {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;

1-2 years from now the support will be greater and you could dismiss this vendor (In other word the prefix is Temporary). Example of this idea:


Related topic : Possible to Control Flexbox Browser Support?


Thank you for the replies. I understand now.