convert svg to base64 using console of developer tool in browser (btoa)

btoa(`svg`)

btoa(`<svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M10 20C15.5229 20 20 15.5229 20 10C20 4.47714 15.5229 0 10 0C4.47714 0 0 4.47714 0 10C0 15.5229 4.47714 20 10 20ZM11.99 7.44666L10.0781 1.5625L8.16626 7.44666H1.97928L6.98465 11.0833L5.07275 16.9674L10.0781 13.3308L15.0835 16.9674L13.1716 11.0833L18.177 7.44666H11.99Z" fill="#FFDF8D"/>
</svg>
`)

"PHN2ZyB3aWR0aD0iMjAiIGhlaWdodD0iMjAiIHZpZXdCb3g9IjAgMCAyMCAyMCIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHBhdGggZmlsbC1ydWxlPSJldmVub2RkIiBjbGlwLXJ1bGU9ImV2ZW5vZGQiIGQ9Ik0xMCAyMEMxNS41MjI5IDIwIDIwIDE1LjUyMjkgMjAgMTBDMjAgNC40NzcxNCAxNS41MjI5IDAgMTAgMEM0LjQ3NzE0IDAgMCA0LjQ3NzE0IDAgMTBDMCAxNS41MjI5IDQuNDc3MTQgMjAgMTAgMjBaTTExLjk5IDcuNDQ2NjZMMTAuMDc4MSAxLjU2MjVMOC4xNjYyNiA3LjQ0NjY2SDEuOTc5MjhMNi45ODQ2NSAxMS4wODMzTDUuMDcyNzUgMTYuOTY3NEwxMC4wNzgxIDEzLjMzMDhMMTUuMDgzNSAxNi45Njc0TDEzLjE3MTYgMTEuMDgzM0wxOC4xNzcgNy40NDY2NkgxMS45OVoiIGZpbGw9IiNGRkRGOEQiLz4KPC9zdmc+Cg=="


use Case: 
<?php
  add_menu_page(
        esc_html__('Word Filter Plugin', 'word-filter-plugin'), 
        esc_html__('Word Filter', 'word-filter-plugin'), 
        'manage_options', 
        'our-word-filter',
        array($this, 'wordFilterPage'), 
        'data:image/svg+xml;base64, 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',
    );
?>