sobex.github.io/dynamic-border-radius.html at main · SOBEX/sobex.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Border Radius Comparison</title>
    <style>
        :root {
            /* Define CSS variables controlled by sliders */
            --border-radius-percent-val: 10%; /* 0-50% range */
            --border-radius-pixel-val: 6px;   /* 0-MAX_PIXEL_RADIUS range */
        }

        body {
            font-family: sans-serif;
            padding: 20px;
            background-color: #f0f0f0; /* Slightly different background */
        }

        /* Base styling for ALL divs (excluding border-radius) */
        div {
            border: 1px solid #ccc;
            padding: 15px;
            margin: 8px;
            background-color: #ffffff;
            /* Transition applied here affects radius changes */
            transition: border-radius 0.15s ease-out;
            min-height: 30px;
            box-sizing: border-box;
            color: #333;
        }

        /* --- Section Specific Radius Rules --- */

        /* Section 1: Percentage Radius */
        .percent-radius-section div {
            border-radius: var(--border-radius-percent-val);
        }

        /* Section 2: Pixel Radius */
        .pixel-radius-section div {
            border-radius: var(--border-radius-pixel-val);
        }

        /* Section 3: Calculated Radius (Percent + Pixels) */
        .calc-radius-section div {
            /* Combine both variables using calc() */
            border-radius: calc(var(--border-radius-percent-val) + var(--border-radius-pixel-val));
        }

        /* --- Flexbox & Item Styles (Common) --- */
        .flex-container {
            display: flex;
            border-width: 2px; /* Keep border width consistent */
            border-style: solid;
            min-height: 250px;
            align-items: stretch;
        }
        .percent-radius-section .flex-container { border-color: dodgerblue; }
        .pixel-radius-section .flex-container { border-color: crimson; }
        .calc-radius-section .flex-container { border-color: darkorchid; }


        .flex-column {
            display: flex;
            flex-direction: column;
            border-width: 2px;
            border-style: solid;
        }
        .percent-radius-section .flex-column { border-color: lightskyblue; }
        .pixel-radius-section .flex-column { border-color: lightcoral; }
        .calc-radius-section .flex-column { border-color: violet; }


        .item {
            background-color: #e0e0e0; /* Neutral base color */
            flex-grow: 1;
            flex-basis: 0;
        }
        .item-1 { flex-grow: 2; } /* Wider item */

        .item-nested {
             background-color: #d0d0d0;
             flex-grow: 1;
             min-height: 50px;
        }

        .item-double-nested {
             background-color: #c0c0c0;
             min-height: 20px;
        }

        /* --- Controls Styling --- */
        .controls {
            /* --- Sticky Behavior --- */
            position: sticky; /* Make the element sticky */
            top: 8px;         /* Stick 8px from the top of the viewport */
            z-index: 10;      /* Ensure it stays above scrolling content */

            /* --- Existing Styles (adjusted slightly) --- */
            margin-top: 15px; /* Reduced top margin */
            margin-bottom: 25px; /* Added bottom margin for spacing when stuck */
            padding: 12px 15px; /* Slightly adjusted padding */
            background-color: #e9e9e9; /* Keep background to hide content behind */
            border: 1px solid #bbb;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1); /* Add subtle shadow for depth */
        }
        /* Exclude controls' CHILDREN from the section radius rules & reset styles */
        .controls div, .controls label, .controls span, .controls input { /* Removed '.controls,' from the start */
            border-radius: initial !important; /* Override section rules */
            border: none;
            background-color: transparent; /* Keep children transparent */
            padding: 0;
            margin: 0 5px 0 0; /* Reset margins/padding */
        }
        .controls div { margin-bottom: 10px; } /* Space between slider rows */
        /* Remove last row bottom margin */
        .controls div:last-child { margin-bottom: 0; }
        .controls label { font-weight: bold; min-width: 120px; display: inline-block;}
        .controls input[type="range"] { width: 250px; vertical-align: middle; cursor: pointer; }
        .controls span { font-weight: bold; min-width: 45px; display: inline-block; text-align: right; vertical-align: middle; }

        /* --- General Layout --- */
        section {
            margin-bottom: 40px;
            padding: 10px;
            border: 1px dashed #999;
        }
        h2 { margin-top: 0; }

    </style>
</head>
<body>

    <h1>Border Radius Comparison: %, px, calc(% + px)</h1>

    <!-- Controls Section -->
    <div class="controls">
        <div>
            <label for="percentSlider">Percentage Base:</label>
            <input type="range" id="percentSlider" min="0" max="100" value="20">
            <span id="percentValue">20%</span>
            <small>(Affects % and Calc sections)</small>
        </div>
        <div>
            <label for="pixelSlider">Pixel Base:</label>
            <input type="range" id="pixelSlider" min="0" max="100" value="20">
            <span id="pixelValue">6px</span>
             <small>(Affects px and Calc sections)</small>
        </div>
    </div>

    <!-- Section 1: Percentage Radius -->
    <section class="percent-radius-section">
        <h2>1. Percentage Radius (<code>border-radius: %</code>)</h2>
        <p>Radius based on element dimensions. Controlled by Percentage slider.</p>
        <!-- Structure copied here -->
        <div class="flex-container">
            <div class="item item-1">Outer Box 1 (Wider)</div>
            <div class="item item-2 flex-column">
                Outer Box 2 (Column)
                <div class="item-nested">Nested Box 2.1</div>
                <div class="item-nested flex-column">
                    Nested Box 2.2 (Column)
                    <div class="item-double-nested">Double Nested 2.2.1</div>
                    <div class="item-double-nested">Double Nested 2.2.2</div>
                </div>
            </div>
            <div class="item item-3">Outer Box 3</div>
        </div>
        <div>Standalone div</div>
    </section>

    <!-- Section 2: Pixel Radius -->
    <section class="pixel-radius-section">
        <h2>2. Pixel Radius (<code>border-radius: px</code>)</h2>
        <p>Fixed radius, circular corners. Controlled by Pixel slider.</p>
        <!-- Structure copied here -->
        <div class="flex-container">
            <div class="item item-1">Outer Box 1 (Wider)</div>
            <div class="item item-2 flex-column">
                Outer Box 2 (Column)
                <div class="item-nested">Nested Box 2.1</div>
                <div class="item-nested flex-column">
                    Nested Box 2.2 (Column)
                    <div class="item-double-nested">Double Nested 2.2.1</div>
                    <div class="item-double-nested">Double Nested 2.2.2</div>
                </div>
            </div>
            <div class="item item-3">Outer Box 3</div>
        </div>
        <div>Standalone div</div>
    </section>

    <!-- Section 3: Calculated Radius -->
    <section class="calc-radius-section">
        <h2>3. Calculated Radius (<code>border-radius: calc(% + px)</code>)</h2>
        <p>Combines percentage and pixel values. Controlled by both sliders.</p>
        <!-- Structure copied here -->
        <div class="flex-container">
            <div class="item item-1">Outer Box 1 (Wider)</div>
            <div class="item item-2 flex-column">
                Outer Box 2 (Column)
                <div class="item-nested">Nested Box 2.1</div>
                <div class="item-nested flex-column">
                    Nested Box 2.2 (Column)
                    <div class="item-double-nested">Double Nested 2.2.1</div>
                    <div class="item-double-nested">Double Nested 2.2.2</div>
                </div>
            </div>
            <div class="item item-3">Outer Box 3</div>
        </div>
        <div>Standalone div</div>
    </section>


    <script>
        // --- Slider References ---
        const percentSlider = document.getElementById('percentSlider');
        const pixelSlider = document.getElementById('pixelSlider');

        // --- Value Display References ---
        const percentValueSpan = document.getElementById('percentValue');
        const pixelValueSpan = document.getElementById('pixelValue');

        // --- Root Element for CSS Variables ---
        const root = document.documentElement;

        // --- Constants ---
        const MAX_PIXEL_RADIUS = 30; // Max pixels when pixel slider is at 100%

        // --- Update Functions ---
        function updatePercentRadius() {
            const sliderValue = percentSlider.value; // 0-100
            // Map slider value (0-100) to CSS percentage (0-50%)
            const cssPercentage = sliderValue / 2;

            // Update the CSS variable for percentage
            root.style.setProperty('--border-radius-percent-val', `${cssPercentage}%`);

            // Update the display span (showing 0-100%)
            percentValueSpan.textContent = `${sliderValue}%`;
        }

        function updatePixelRadius() {
            const sliderValue = pixelSlider.value; // 0-100
            // Map slider value (0-100) to pixel value (0-MAX_PIXEL_RADIUS)
            const pixelValue = (sliderValue / 100) * MAX_PIXEL_RADIUS;

            // Update the CSS variable for pixels
            root.style.setProperty('--border-radius-pixel-val', `${pixelValue}px`);

            // Update the display span (showing calculated px value)
            // Use toFixed(1) for cleaner display if MAX_PIXEL_RADIUS isn't round
            pixelValueSpan.textContent = `${pixelValue.toFixed(1)}px`;
        }

        // --- Event Listeners ---
        percentSlider.addEventListener('input', updatePercentRadius);
        pixelSlider.addEventListener('input', updatePixelRadius);

        // --- Initial Update on Load ---
        updatePercentRadius();
        updatePixelRadius();
    </script>

</body>
</html>