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What attribute will you use to not display a border around the iframe?

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What attribute will you use to make a cell span more than one column?

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Select a correct code to display a web page within a web page.

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Select correct attributes for <img> HTML tag?

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How can you center an image (in relation to parent block) ? If the conditions are: div#parent - the parent block; img - an image which has to be centered. Choose correct statements for realization.

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What does the property clear: right; do?

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How to set a green background for even-numbered rows only? <table>     <tr>          <td>name</td>          <td>one</td>     </tr>      <tr>          <td>name</td>          <td>two</td>     </tr>      <tr>          <td>name</td>          <td>three</td>     </tr>      <tr>          <td>name</td>          <td>four</td>     </tr> </table>

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There is HTML with a nested stylesheet: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Margin test</title> <style type="text/css"> #div1 { position: absolute; width: 200px; height: 100px; border: none; padding: 0; background: green; } #div2 { margin-top: 20%; border: none; padding: 0; background: red; color: red; } </style> </head> <body> <div id="div1"> <div id="div2">*</div> </div> </body> </html> What will be the margin-top value for the block with identifier div2 calculated in pixels?

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How do I set a background image for the item that would be repeated horizontally? (choose all the correct options).

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What does the next property do? text-decoration:line-through