<!DOCTYPE html>
<html>
<head>
    <title>Dynamic Form Validation Example</title>
    <style>
        .error {
            color: red;
        }
    </style>
</head>
<body>

    <h2>Dynamic Form Validation Example</h2>
    
    <form id="dynamicForm" onsubmit="return validateDynamicForm()">
        <label for="dynamicField">Dynamic Field:</label>
        <input type="text" id="dynamicField" name="dynamicField">
        <span id="dynamicFieldError" class="error"></span>

        <br>

        <input type="submit" value="Submit">
    </form>

    <script>
        function validateDynamicForm() {
            var dynamicField = document.getElementById('dynamicField');
            var dynamicValue = dynamicField.value;
            var dynamicFieldError = document.getElementById('dynamicFieldError');
            
            // Reset error message
            dynamicFieldError.innerHTML = "";

            // Validate based on dynamic criteria (Example: Minimum length of 5 characters)
            if (dynamicValue.length < 5) {
                dynamicFieldError.innerHTML = "Dynamic field must be at least 5 characters";
                return false;
            }

            // Form is valid
            alert("Dynamic form submitted successfully!");
            return true;
        }
    </script>

</body>
</html>
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