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HTML

              
                <!doctype html>
<html class="wp-toolbar interface-interface-skeleton__html-container" lang="en-US"><head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Flickering Text in Safari</title>
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
</head>
<body>
    <div class="interface-interface-skeleton__body">
            <div class="interface-interface-skeleton__content" role="region" aria-label="Editor content" tabindex="-1">
                <div class="edit-post-visual-editor">
                    <div class="components-popover block-editor-block-list__insertion-point-popover is-without-arrow">
                    <!-- resize listener from react-resize-aware -->
                    <iframe src="about:blank"></iframe>
                </div>
                <div class="editor-styles-wrapper">
                    <!-- These position fixed divs also cause a large compositing layer to be created. Position fixed divs were used to help catch focus to prevent scrolling on tab. -->
                    <div tabindex="0" style="position: fixed;"></div>
                    <div class="block-editor-writing-flow">
                        <div class="block-editor-block-list__layout is-root-container" data-is-drop-zone="true">
                            <div class="wp-block-cover">
                                <div class="wp-block-cover__inner-container">
                                    <p class="wp-block-paragraph">This text will flicker on scroll in Safari</p>
                                </div>
                            </div>
                            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ultrices, ipsum in aliquet faucibus, elit tortor egestas purus, sit amet malesuada odio urna id diam. Curabitur vitae elit nec justo sodales blandit. Pellentesque tincidunt turpis leo, at porttitor elit egestas sed. Maecenas condimentum tellus lectus, non luctus nibh sodales nec. Pellentesque a dolor interdum ligula imperdiet pulvinar eget ac tortor. Phasellus gravida lobortis fermentum. Integer convallis, risus id semper bibendum, felis dui rutrum odio, ut vestibulum dui erat et velit. Nullam ut ligula porta, consectetur est eu, auctor augue. Suspendisse venenatis sed tortor at elementum. Sed eget tellus mi.</p>

                            <p>Nam sed sagittis est, vitae blandit enim. Vestibulum ut fringilla ante. Nulla fringilla, dui ut blandit blandit, ipsum purus posuere turpis, nec sagittis mi ex at lacus. Curabitur est sapien, interdum vel molestie id, vulputate sed leo. In tempor in est nec tempor. Morbi tincidunt leo non sodales rutrum. Vivamus ornare ante et magna cursus, vitae efficitur purus aliquam. Mauris elit enim, congue et erat id, condimentum imperdiet dui. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Cras iaculis euismod lacus, ut mollis ex mattis ut. Duis lectus lectus, interdum id bibendum non, volutpat at felis. Donec maximus urna vitae ex elementum bibendum ac ut odio. Praesent luctus laoreet justo, a cursus tellus sagittis in. Maecenas ac ultricies dui, non euismod dui.</p>
                        </div>
                    </div>
                    <!-- These position fixed divs also cause a large compositing layer to be created. Position fixed divs were used to help catch focus to prevent scrolling on tab. -->
                    <div tabindex="0" style="position: fixed;"></div>
                </div>
                </div>
            </div>
        </div>
    </body>
</html>
              
            
!

CSS

              
                   /* general */
        html,
        body {
            height: 100%;
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
            font-size: 24px;
            line-height: 1.4em;
            min-width: 600px;
        }
        iframe {
            border: 0;
            position: absolute;
            display: block;
        }
        /* end general */
        .interface-interface-skeleton__body {
            flex-grow: 1;
            display: flex;
            overflow: auto;
        }
        .interface-interface-skeleton__content {
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            overflow: auto;
            z-index: 20;
            height: 90vh;
        }
        .edit-post-visual-editor {
            position: relative;
            display: flex;
            flex-flow: column;
            flex: 1 1 auto;
        }
        .block-editor-block-list__insertion-point-popover.is-without-arrow {
            z-index: 28;
            position: absolute;
        }

        .wp-block-cover {
            background-color: #000;
        }
        .wp-block-cover {
            position: relative;
            min-height: 430px;
            width: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 1em;
            box-sizing: border-box;
        }
        .wp-block-cover-image .wp-block-cover__inner-container,
        .wp-block-cover .wp-block-cover__inner-container {
            width: 100%;
            z-index: 1;
            color: #fff;
        }
              
            
!

JS

              
                
              
            
!
999px

Console