Template:Styles/endowment.css

/* To be used with addStyle parameter. Replaces WMF logo with Endowment logo. */

@media (-webkit-min-device-pixel-ratio: 2), not all, (min-resolution: 2dppx), (min-resolution: 192dpi) {
    html body .mw-wiki-logo {
        background-image: url(https://upload.wikimedia.org/wikipedia/donate/8/85/Wikimedia_Endowment_2x.png);
        background-size: 135px auto;
    }
}

@media (-webkit-min-device-pixel-ratio: 1.5), not all, (min-resolution: 1.5dppx), (min-resolution: 144dpi) {
    html body .mw-wiki-logo {
        background-image: url(https://upload.wikimedia.org/wikipedia/donate/4/49/Wikimedia_Endowment_1.5x.png);
        background-size: 135px auto;
    }
}

html body .mw-wiki-logo {
    background-image: url(https://upload.wikimedia.org/wikipedia/donate/4/49/Wikimedia_Endowment.png);
}