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function post(url, data) {
    return new Promise((resolve, reject) => {
        let xhr = new XMLHttpRequest();
        xhr.open('POST', url);
        xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8');

        xhr.addEventListener('load', () => {
            let { response, status } = xhr;
            let res = JSON.parse(response);
            if(status >= 200 && status < 400){

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:focus-visible is a standard way of only showing focus styles for keyboard and focus-based modalities. When using it, however, you must take care to not remove :focus altogether, where :focus-visible is not supported.

With CSS, we can achieve progressive enhancement of :focus to :focus-visible:

/* Styles where only focus is supported */
button:focus,