Split Button Dropdown

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Split Button with Dropdown</title>
    <style>
        /*
         Component: Split Button with Dropdown
         Description: A two-part button with a primary action and a dropdown menu.
        */
        :root {
            --split-btn-bg: #28a745;
            --split-btn-text-color: #ffffff;
            --split-btn-border-color: #23923d;
            --split-btn-bg-hover: #218838;
            --split-btn-focus-outline: #28a745;
            --split-btn-menu-bg: #ffffff;
            --split-btn-menu-shadow: 0 8px 16px rgba(0,0,0,0.15);
            --split-btn-menu-item-hover: #f8f9fa;
        }

.split-btn-container-1 {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 4rem 2rem; /* Extra padding to see dropdown */
            background-color: #f8f9fa;
        }

.split-btn-1 {
            position: relative;
            display: inline-flex;
        }
        
        .split-btn-1 button,
        .split-btn-1 a {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.5;
            color: var(--split-btn-text-color);
            background-color: var(--split-btn-bg);
            border: 1px solid var(--split-btn-border-color);
            padding: 0.75rem 1.5rem;
            cursor: pointer;
            transition: background-color 0.15s ease-in-out;
        }
        .split-btn-1 button:hover,
        .split-btn-1 a:hover {
            background-color: var(--split-btn-bg-hover);
        }

.split-btn-main {
            border-top-left-radius: 8px;
            border-bottom-left-radius: 8px;
        }

.split-btn-dropdown {
            border-top-right-radius: 8px;
            border-bottom-right-radius: 8px;
            border-left: none;
            padding: 0.75rem 0.75rem;
        }
        
        .split-btn-dropdown svg {
            display: block;
            width: 16px;
            height: 16px;
            fill: currentColor;
        }
        
        .split-btn-1:focus-within {
             box-shadow: 0 0 0 3px var(--split-btn-focus-outline);
             border-radius:8px;
        }

/* Menu Styles */
        .split-btn-menu {
            position: absolute;
            top: 100%;
            left: 0;
            margin-top: 0.5rem;
            list-style: none;
            padding: 0.5rem 0;
            background-color: var(--split-btn-menu-bg);
            border: 1px solid #ddd;
            border-radius: 8px;
            box-shadow: var(--split-btn-menu-shadow);
            min-width: 100%;
            z-index: 10;
            opacity: 0;
            transform: translateY(-10px);
            visibility: hidden;
            transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s 0.2s;
        }
        
        .split-btn-1.is-open .split-btn-menu {
            opacity: 1;
            transform: translateY(0);
            visibility: visible;
            transition-delay: 0s;
        }
        
        .split-btn-menu li a {
            display: block;
            padding: 0.75rem 1.5rem;
            color: #333;
            background: none;
            border: none;
            text-decoration: none;
            white-space: nowrap;
        }
        .split-btn-menu li a:hover {
            background-color: var(--split-btn-menu-item-hover);
            color: #000;
        }

</style>
</head>
<body>

<div class="split-btn-container-1">
        <div class="split-btn-1" id="splitBtn1">
            <button type="button" class="split-btn-main">Save Changes</button>
            <button type="button" class="split-btn-dropdown" aria-haspopup="true" aria-expanded="false" aria-label="More save options">
                <svg viewBox="0 0 16 16"><path d="M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z"/></svg>
            </button>
            <ul class="split-btn-menu" role="menu">
                <li><a href="#" role="menuitem">Save as New...</a></li>
                <li><a href="#" role="menuitem">Save &amp; Continue</a></li>
                <li><a href="#" role="menuitem">Export as PDF</a></li>
            </ul>
        </div>
    </div>

dropdownToggle.addEventListener('click', (event) => {
                event.stopPropagation();
                const isExpanded = dropdownToggle.getAttribute('aria-expanded') === 'true';
                if (isExpanded) {
                    closeDropdown();
                } else {
                    splitButtonContainer.classList.add('is-open');
                    dropdownToggle.setAttribute('aria-expanded', 'true');
                }
            });

document.addEventListener('click', (event) => {
                if (!splitButtonContainer.contains(event.target)) {
                    closeDropdown();
                }
            });

document.addEventListener('keydown', (event) => {
                if (event.key === 'Escape') {
                    closeDropdown();
                }
            });
        });
    </script>
</body>
</html>