<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <title>Windows Interfaces Gallery</title>

    <meta name="description" content="A gallery of Windows interfaces from different versions, including fictional representations of unreleased versions.">

    <meta name="keywords" content="Windows, interfaces, gallery, simulation, web app">

    <style>

        body, html {

            height: 100%;

            margin: 0;

            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;

        }

        .screen {

            float: left;

            width: 50%;

            height: 50%;

            box-sizing: border-box;

            padding: 20px;

            display: flex;

            align-items: center;

            justify-content: center;

            position: relative;

            overflow: hidden;

        }

        .screen:nth-child(odd) {

            border-right: 2px dashed #aaa;

        }

        .screen:nth-child(even) {

            border-left: 2px dashed #aaa;

        }

        .screen:nth-child(1), .screen:nth-child(2), .screen:nth-child(3), .screen:nth-child(4) {

            border-bottom: 2px dashed #aaa;

        }

        .screen:nth-child(5), .screen:nth-child(6), .screen:nth-child(7), .screen:nth-child(8) {

            border-top: 2px dashed #aaa;

        }

        .os-label {

            position: absolute;

            bottom: 10px;

            right: 10px;

            background: rgba(0, 0, 0, 0.7);

            color: #fff;

            padding: 5px 10px;

            border-radius: 5px;

            font-size: 12px;

        }

        .screen-content {

            text-align: center;

            color: #333;

            font-size: 24px;

        }

        /* Styles for fictional Windows 9 and Windows 6 */

        .win9 .screen-content {

            background: linear-gradient(#3C3C3C, #2E2E2E);

            color: #fff;

        }

        .win6 .screen-content {

            background: linear-gradient(#4B6C9E, #3A557B);

            color: #fff;

        }

        /* Additional styles may be added for each version to resemble the actual OS interface */

    </style>

</head>

<body>

    <div class="screen win10">

        <div class="screen-content">Windows 10</div>

        <div class="os-label">Windows 10</div>

    </div>

    <div class="screen win9">

        <div class="screen-content">Windows 9 (Fictional)</div>

        <div class="os-label">Windows 9 (Fictional)</div>

    </div>

    <div class="screen win8">

        <div class="screen-content">Windows 8</div>

        <div class="os-label">Windows 8</div>

    </div>

    <div class="screen win7">

        <div class="screen-content">Windows 7</div>

        <div class="os-label">Windows 7</div>

    </div>

    <div class="screen win6">

        <div class="screen-content">Windows 6 (Fictional)</div>

        <div class="os-label">Windows 6 (Fictional)</div>

    </div>

    <div class="screen winnt5">

        <div class="screen-content">Windows NT 5.0</div>

        <div class="os-label">Windows NT 5.0</div>

    </div>

    <div class="screen winnt4">

        <div class="screen-content">Windows NT 4.0</div>

        <div class="os-label">Windows NT 4.0</div>

    </div>

    <div class="screen win3">

        <div class="screen-content">Windows 3.0</div>

        <div class="os-label">Windows 3.0</div>

    </div>

    <div class="screen win2">

        <div class="screen-content">Windows 2.0</div>

        <div class="os-label">Windows 2.0</div>

    </div>

    <div class="screen win1">

        <div class="screen-content">Windows 1.0</div>

        <div class="os-label">Windows 1.0</div>

    </div>

</body>

</html>