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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div class="modal" role="dialog" aria-labelledby="Modal_Title" aria-describedby="Modal_Description" aria-hidden="true" style="display: none">
    <div class="modal-content">
        <h2 id="Modal_Title">Delete Confirmation</h2>
        <p id="Modal_Description" class="visually-hidden">Some visually hidden text describing how to use the modal.</p>
        <input type="text" value="first focusable element"><br><br>
        <button class="close-modal">Close Modal</button>
    </div>
</div>
<main>
    <button class="open-modal">Open Modal</button>
    
    <br>
    <br>
    <br>
    <button>This element shouldnt receive focus when the modal is open</button>
</main>
            
          
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              .modal {
    position: fixed;
    background: rgba(0, 0, 0, .6);
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.modal-content {
    width: 250px;
    height: 250px;
    background: white;
    padding: 20px;
}

.visually-hidden {
  position: absolute !important;
  height: 1px; width: 1px; 
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
}

*:focus {
    outline: 3px dashed blue;
}

            
          
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              // Open this pen in debug mode for testing
// https://codepen.io/noahblon/debug/b7896f6eb7f0a5bd84e245825ee357cd
// This is a sketch of some principles of an accessible modal - trying to keep it simple.  For a more complete demonstration, check out: https://github.com/gdkraus/accessible-modal-dialog

const FOCUSABLE_SELECTORS = 'a[href], area[href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), iframe, object, embed, *[tabindex], *[contenteditable]';

const openModalBtn = document.querySelector('.open-modal');
const closeModalBtn = document.querySelector('.close-modal');
const modal = document.querySelector('.modal');
const main = document.querySelector('main');

function openModal() {
    // show the modal
    modal.style.display = 'flex';
    
    // Focus the first element within the modal. Make sure the element is visible and doesnt have focus disabled (tabindex=-1);
    modal.querySelector(FOCUSABLE_SELECTORS).focus();

    // Trap the tab focus by disable tabbing on all elements outside of your modal.  Because the modal is a sibling of main, this is easier. Make sure to check if the element is visible, or already has a tabindex so you can restore it when you untrap.    
    const focusableElements = main.querySelectorAll(FOCUSABLE_SELECTORS);
    focusableElements.forEach(el => el.setAttribute('tabindex', '-1'));

    // Trap the screen reader focus as well with aria roles. This is much easier as our main and modal elements are siblings, otherwise you'd have to set aria-hidden on every screen reader focusable element not in the modal.
    modal.removeAttribute('aria-hidden');
    main.setAttribute('aria-hidden', 'true');
}

function closeModal() {
    // hide the modal
    modal.style.display = 'none';

    // Untrap the tab focus by removing tabindex=-1. You should restore previous values if an element had them.    
    const focusableElements = main.querySelectorAll(FOCUSABLE_SELECTORS);
    focusableElements.forEach(el => el.removeAttribute('tabindex'));
    
    // Untrap screen reader focus
    modal.setAttribute('aria-hidden', 'true');
    main.removeAttribute('aria-hidden');
    
    // restore focus to the triggering element
    openModalBtn.focus();
}

openModalBtn.addEventListener('click', openModal);
closeModalBtn.addEventListener('click', closeModal);

            
          
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