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count_down_timer.html
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<!--
/**
* file: count_down_timer.html
* type: Hyper-Text-Markup-Language
* author: karbytes
* date: 10_JULY_2023
* license: PUBLIC_DOMAIN
*/
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>COUNT_DOWN_TIMER</title>
<link rel="stylesheet" href="karbytes_aesthetic.css">
<script src="count_down_timer.js"></script>
<script src="time_stamp.js"></script>
<style>
/**
* Set DIV borders to have a thickness of 2 pixel thick and to be solid colored CYAN.
* Set DIV content to have 10 pixels of padding on each one of the four sides.
* Set DIV elements to have 10 pixels of padding on the bottom side.
*/
div {
border-color: #00ffff;
border-width: 2px;
border-style: solid;
padding: 10px;
margin-bottom: 10px;
}
</style>
</head>
<body onload="initialize_application()">
<!-- Display instructions for how to use the application. -->
<div>
<h1>COUNT_DOWN_TIMER</h1>
<p><em>“Time is what makes the observation of change possible.”</em></p>
<p><em>“Time is what prevents all phenomena from being perceived as occurring simultaneously.”</em></p>
<p>Instantiate a time interval which is N seconds in length.</p>
</div>
<!-- Display an expandable SELECT menu of timer interval lengths. -->
<div>
<p>STEP_0: Select a natural number of seconds, N, from the menu.</p>
<p>N :=
<select id="nonnegative_integer_interval_selector">
<option value="30" selected>30 seconds</option>
<option value="60">60 seconds (i.e. 1 minute)</option>
<option value="120">120 seconds (i.e. 2 minutes)</option>
<option value="240">240 seconds (i.e. 4 minutes)</option>
<option value="480">480 seconds (i.e. 8 minutes)</option>
<option value="960">960 seconds (i.e. 16 minutes)</option>
</select>
</p>
<p>(Click the menu to view hidden options).</p>
</div>
<!-- Display a button which starts the timer session of N seconds. -->
<div>
<p>STEP_1: Click the button to start counting down from N to 0 seconds.</p>
<p><input id="timer_start_button" type="button" value="start()" onclick="start()"></p>
</div>
<!-- Display the integer number of seconds remaining for the "in progress" timer session. -->
<div class="console" id="seconds_elapsed_display">
<p>???</p>
</div>
<!-- Display time-stamped messages denoting specific events while using the web page application. -->
<div class="console" id="application_status_messages_display">
<p>???</p>
</div>
</body>
</html>