Source/WebCore/html/shadow/imageOverlay.css

/*
 * Copyright (C) 2021 Apple Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

div#image-overlay {
    display: inline-block;
    pointer-events: none;
    position: relative;
    overflow: hidden;
    color: transparent;
    text-shadow: none;
    text-align: center;
    font-family: system-ui;
}

div.image-overlay-line {
    white-space: nowrap;
    line-height: 100%;
    font-size: 1024px; /* This large font size is chosen to minimize gaps when painting selection quads. */
}

div.image-overlay-line, div.image-overlay-block {
    pointer-events: auto;
}

div.image-overlay-block {
    background-color: rgba(255, 255, 255, 0.75);
    border-radius: calc(clamp(2px, 0.1em, 12px));
    box-shadow: rgba(100, 100, 100, 0.2) 3px 4px 8px 4px;
    color: rgb(90, 90, 90);
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-content: center;
    flex-direction: column;
    -webkit-backdrop-filter: blur(8px);
}

div.image-overlay-line, .image-overlay-text, div.image-overlay-block {
    position: absolute;
    overflow: hidden;
}

.image-overlay-text::selection {
    color: transparent;
    background-color: highlight;
}

div.image-overlay-data-detector-result {
    position: absolute;
    -webkit-user-select: none;
}