How can I add a download button to my PHP/HTML table populated from multiple drop-down menus?

First of all im new to php, i have two forms that select from the same table a project and a quarter the it is displayed in a table format, i have tried that and it works fine and the results are got, but what i want now is to download what has been selected here is a code

 <?php foreach($developersData as $developer) { ?>
   
                                <tr>
                                <td class="annualworkplan"><?php echo $row4['activities']; ?></td>
                                <td class="annualworkplan"><?php echo $row4['annualoutput']; ?></td>
                                <td class="annualworkplan"><?php echo $row4['annualbudget']; ?></td>
                                <td class="quarterlyworkplan"><?php echo $row4['q4interim']; ?></td>
                                <td class="quarterlyworkplan"><?php echo $row4['q4kpi']; ?></td>
                                <td class="quarterlyworkplan"><?php echo $row4['q4budget']; ?></td>
                                <td class="thcolor"> 
                                <div contentEditable='true' onkeypress="return (this.innerText.length <= 200)" 
                                oncopy="return false" oncut="return false" onpaste="return false"
                                class='edit' id='actualoutput4_<?php echo $row4['id']; ?>' >
                                <?php echo $row4['actualoutput4']; ?>
                                </div> 
                                </td>
                                <td class="thcolor">  
                                <div contentEditable='true' class='edit' 
                                id='actualkpi4_<?php echo $row4['id']; ?>'>
                                <?php echo $row4['actualkpi4']; ?>
                                </div> 
                                </td>
                                <td class="thcolor">   
                                <div contentEditable='true' class='edit' id='actualbudget4_<?php echo $row4['id']; ?>'>
                                <?php echo $row4['actualbudget4']; ?>
                                </div> 
                                </td>
                                <td class="quarterlyperf"><?php echo $row4['variance4']; ?></td>
                                <td class="quarterlyperf"><?php echo $row4['budgetperf4']; ?></td>
                                
                                </tr>
                                
                                <?php } ?>              '