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CSS

Highlight Empty Alt Text Fields in the Media Modal

Outlines the Alternative Text field in red when it is empty in the media library and media modal, so authors notice it before inserting an image.

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Code

.attachment-details .setting.alt-text textarea:placeholder-shown,
.attachment-details [data-setting="alt"] textarea:placeholder-shown,
#attachment_alt:placeholder-shown {
    border: 2px solid #d63638 !important;
    background: #fcf0f1 !important;
}

.attachment-details [data-setting="alt"] .name::after,
.setting.alt-text .name::after {
    content: " (needed)";
    color: #d63638;
    font-weight: 600;
}

Notes

Pure CSS; it reminds but does not block inserting images.

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