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   <head>
   <!--
      New Perspectives on HTML and CSS
      Tutorial 5
      Case Problem 1

      Sudoku Puzzle
      Author: Mario Lara
      Date:   10/10/2021

      Filename:         sudoku.htm
      Supporting files: gold.jpg, green.jpg, jpf.css, jpf.jpg, 
                        modernizr-1.5.js, stable.css,
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      <title>Daily Sudoku Puzzle</title>
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      <header>
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         <ul>
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      <section id="main">
      <table class="spuzzle">
       <caption>Sudoku</caption>
       <thead>
        <tr>
         <th></th>
         <th>1</th>
         <th>2</th>
         <th>3</th>
         <th>4</th>
         <th>5</th>
         <th>6</th>
         <th>7</th>
         <th>8</th>
         <th>9</th>
        </tr>
       </thead>
      <tbody>
       <tr> 
       	<th>A</th><colgroup>
		<col class="greenBox" span="3">	
	</colgroup>
       </tr>
       <tr> 
         <th>B</th>

	    <td class="greenBox"> 1 </td>

            <td class="greenBox"> 2 </td>

            <td class="greenBox"> 3 </td>

            <td> 4 </td>

            <td> 5 </td>

            <td> 6 </td>

            <td class="greenBox"> 7 </td>

            <td class="greenBox"> 8 </td>

            <td class="greenBox"> 9 </td>
       </tr>
       <tr> 
         <th>C</th>

	    <td class="greenBox"> 1 </td>

            <td class="greenBox"> 2 </td>

            <td class="greenBox"> 3 </td>

            <td> 4 </td>

            <td> 5 </td>

            <td> 6 </td>

            <td class="greenBox"> 7 </td>

            <td class="greenBox"> 8 </td>

            <td class="greenBox"> 9 </td>
       </tr>
       <tr> 
         <th>D</th>

	    <td> 1 </td>

            <td> 2 </td>

            <td> 3 </td>

            <td class="greenBox"> 4 </td>

            <td class="greenBox"> 5 </td>

            <td class="greenBox"> 6 </td>

            <td> 7 </td>

            <td> 8 </td>

            <td> 9 </td>
       </tr>
       <tr> 
         <th>E</th>

	    <td> 1 </td>

            <td> 2 </td>

            <td> 3 </td>

            <td class="greenBox"> 4 </td>

            <td class="greenBox"> 5 </td>

            <td class="greenBox"> 6 </td>

            <td> 7 </td>

            <td> 8 </td>

            <td> 9 </td>
       </tr>
       <tr> 
         <th>F</th>

	    <td> 1 </td>

            <td> 2 </td>

            <td> 3 </td>

            <td class="greenBox"> 4 </td>

            <td class="greenBox"> 5 </td>

            <td class="greenBox"> 6 </td>

            <td> 7 </td>

            <td> 8 </td>

            <td> 9 </td>
       </tr>
       <tr> 
         <th>G</th>

	    <td class="greenBox"> 1 </td>

            <td class="greenBox"> 2 </td>

            <td class="greenBox"> 3 </td>

            <td> 4 </td>

            <td> 5 </td>

            <td> 6 </td>

            <td class="greenBox"> 7 </td>

            <td class="greenBox"> 8 </td>

            <td class="greenBox"> 9 </td>
       </tr>
       <tr> 
         <th>H</th>

	    <td class="greenBox"> 1 </td>

            <td class="greenBox"> 2 </td>

            <td class="greenBox"> 3 </td>

            <td> 4 </td>

            <td> 5 </td>

            <td> 6 </td>

            <td class="greenBox"> 7 </td>

            <td class="greenBox"> 8 </td>

            <td class="greenBox"> 9 </td>
       </tr>
       <tr> 
         <th>I</th>

	    <td> 1 </td>

            <td> 2 </td>

            <td> 3 </td>

            <td> 4 </td>

            <td> 5 </td>

            <td> 6 </td>

            <td> 7 </td>

            <td> 8 </td>

            <td> 9 </td>
       </tr>

      </tbody>
      </table>
         <article>
            <h1>To Play</h1>
            <p>Sudoku is played on a 9x9 grid with nine 3x3 boxes
               placed within the grid. Enter a digit from 1 to 9 in
               each table cell. A few starting numbers have been
               supplied for you. The digits from 1 to 9 can appear
               only once each in every row, column, and box in the
               table (diagonals don't count). Every Sudoku puzzle
               has a unique solution.
            </p>
            <p>Good luck!</p>
         </article>

      </section>

   </body>

</html>

created 3 years ago by Nemi Roberts

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Any HTML document must start with document declaration <!DOCTYPE html>
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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.
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Do not forget the end tag.
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HTML Tables

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Table row should be defined in <tr> tag
Table header should be defined in <th> tag
Table data should be defined in <td> tag
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HTML-Javascript

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Example

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