<!DOCTYPE html>
<html>
  <head>
    <title>Hello, World!</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
      <h1 class="title">Hello World! </h1>
      <p id="currentTime"></p>
      <script src="script.js"></script>
  </body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Prayer Times</title>
  <style>
    .clock {
      font-size: 3em;
      text-align: center;
      margin-top: 5%;
    }
    
    .prayer-times {
      font-size: 1.5em;
      text-align: center;
      margin-top: 5%;
    }

    .remaining-time {
      font-size: 2em;
      text-align: center;
      margin-top: 5%;
    }
  </style>
</head>
<body>
  <div class="clock" id="clock"></div>
  
  <!-- Add remaining time HTML here -->
  <div class="remaining-time" id="remainingTime"></div>
  
  <div class="prayer-times" id="prayerTimes">
    <p>Fajr ----------- 4:55</p>
    <p>Dhuhr ----------- 13:30</p>
    <p>Asr ----------- 17:15</p>
    <p>Maghrib ---------- 18:39</p>
    <p>Isha ---------- 20:30</p>
  </div>

  <script>
    // Prayer times
    const prayerTimes = [
      { name: "Fajr", hour: 4, minute: 55 },
      { name: "Dhuhr", hour: 13, minute: 30 },
      { name: "Asr", hour: 17, minute: 15 },
      { name: "Maghrib", hour: 18, minute: 39 },
      { name: "Isha", hour: 20, minute: 30 }
    ];

    // Function to calculate remaining time for next prayer
    function calculateRemainingTime() {
      const now = new Date();
      const currentHour = now.getHours();
      const currentMinute = now.getMinutes();
      const currentSecond = now.getSeconds();

      let remainingTime = "";
      let nextPrayerIndex = -1;

      // Finding the next prayer
      for (let i = 0; i < prayerTimes.length; i++) {
        if (currentHour < prayerTimes[i].hour || (currentHour === prayerTimes[i].hour && currentMinute < prayerTimes[i].minute)) {
          nextPrayerIndex = i;
          break;
        }
      }

      if (nextPrayerIndex !== -1) {
        const nextPrayer = prayerTimes[nextPrayerIndex];
        let remainingHour = nextPrayer.hour - currentHour;
        let remainingMinute = nextPrayer.minute - currentMinute;
        let remainingSecond = 60 - currentSecond;

        // Adjust remaining time if the next prayer is in the next hour
        if (remainingMinute < 0) {
          remainingHour -= 1;
          remainingMinute += 60;
        }

        // Format remaining time
        remainingTime = (remainingHour > 0 ? remainingHour + ":" : "") + (remainingMinute < 10 ? "0" : "") + remainingMinute;
      } else {
        // If it's already past Isha, calculate remaining time until Fajr of the next day
        const nextFajr = prayerTimes[0];
        const remainingHour = 24 - currentHour + nextFajr.hour;
        const remainingMinute = nextFajr.minute - currentMinute;
        const remainingSecond = 60 - currentSecond;

        // Format remaining time
        remainingTime = (remainingHour > 0 ? remainingHour + ":" : "") + (remainingMinute < 10 ? "0" : "") + remainingMinute;
      }

      // Display remaining time
      document.getElementById("remainingTime").innerText = remainingTime;
    }

    calculateRemainingTime();
    setInterval(calculateRemainingTime, 1000); // Update every second

    // Function to update clock every second
    function updateTime() {
      const now = new Date();
      const hours = String(now.getHours()).padStart(2, "0");
      const minutes = String(now.getMinutes()).padStart(2, "0");
      const seconds = String(now.getSeconds()).padStart(2, "0");
      const timeString = hours + ":" + minutes + ":" + seconds;
      document.getElementById("clock").innerText = timeString;
    }
    updateTime();
    setInterval(updateTime, 1000); // Update every second
  </script>
</body>
</html> 

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About HTML

HTML(Hyper Text Markup language) is the standard markup language for Web pages, was created by Berners-Lee in the year 1991. Almost every web page over internet might be using HTML.

Syntax help

Fundamentals

  • Any HTML document must start with document declaration <!DOCTYPE html>
  • HTML documents begin with <html> and ends with </html>
  • Headings are defined with <h1> to <h6> where <h1> is the highest important heading and <h6> is the least important sub-heading.
  • Paragrahs are defined in <p>..</p> tag.
  • Links are defined in <a> tag.

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  • Images are defined in <img> tag, where src attribute consists of image name.
  • Buttons are defined in <button>..</button> tag
  • Lists are defined in <ul> for unordered/bullet list and <ol> for ordered/number list, and the list items are defined in <li>.

HTML Elements and Attributes

  • HTML element is everything present from start tag to end tag.
  • The text present between start and end tag is called HTML element content.
  • Anything can be a tagname but it's preferred to put the meaningful title to the content present as tag name.
  • Do not forget the end tag.
  • Elements with no content are called empty elements.
  • Elements can have attributes which provides additional information about the element.
  • In the below example, href is an attribute and a is the tag name.

    Example:

    <a href="https://onecompiler.com/html">HTML online compiler</a>
    

CSS

CSS(cascading style sheets) describes how HTML elements will look on the web page like color, font-style, font-size, background color etc.

Example:

Below is a sample style sheet which displays heading in green and in Candara font with padding space of 25px.

body{
  padding: 25px;
}
.title {
	color: #228B22;
	font-family: Candara;
}

HTML Tables

  • HTML Tables are defined in <table> tag.
  • Table row should be defined in <tr> tag
  • Table header should be defined in <th> tag
  • Table data should be defined in <td> tag
  • Table caption should be defined in <caption> tag

HTML-Javascript

  • Javascript is used in HTML pages to make them more interactive.
  • <script> is the tag used to write scripts in HTML
  • You can either reference a external script or write script code in this tag.

Example

<script src="script.js"></script>