• There is a life beyond pixels and percentages. Using px units is fine in certain cases, the real mistake is using absolute instead of relative units.

    p {
    font-size: 16px;
    line-height: 20px;
    margin-bottom: 8px;
    }
    Check out what is going on here ⇸
  • Variable fonts are awesome, but unnecessary usage of font-variation-settings will eventually break your styles.

    .bold {
    font-variation-settings: 'wght'700;
    }

    .italic {
    font-variation-settings: 'ital'1;
    }

    Check out what is going on here ⇸
  • Specificity determines, which CSS rule is applied by the browsers. Developers often write overly specific selectors just to be 10000% sure their rules will rule.

    div#my-popup div span.my-radiocheckbox-label-text {
    color: #666;
    }

    #some-id .label {
    color: #111 !important;
    }

    Check out what is going on here ⇸
  • Specifying the primary font for almost every selector is not a good approach, yet I often run into this issue.

    .my-class-1 {
    font-family: Roboto;
    }

    .my-class-2 {
    font-family: Roboto;
    }

    p {
    font-family: Roboto;
    }

    .my-class-3 {
    font-family: Roboto;
    }

    footer {
    font-family: Roboto;
    }

    Check out what is going on here ⇸
  • Browser vendors sometimes add prefixes to experimental or nonstandard CSS properties and JavaScript APIs, so developers can experiment with new ideas while — in theory — preventing their experiments from being relied upon and then breaking web developers’ code during the standardization process.

    .my-class {
    -webkit-transition: left 400ms ease-out;
    -webkit-transition: left 400ms ease-out;
    -moz-transition: left 400ms ease-out;
    -ms-transition: left 400ms ease-out;
    -o-transition: left 400ms ease-out;
    transition: left 400ms ease-out;
    }
    Check out what is going on here ⇸
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