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|  | 1 <!DOCTYPE html> | 
|  | 2 <html lang=en> | 
|  | 3 <meta charset="utf-8"> | 
|  | 4 <title>Selectors Level 4: focus-within</title> | 
|  | 5 <link rel="author" title="Keyong Li" href="mailto:kli79@bloomberg.net"> | 
|  | 6 <link rel="author" title="Florian Rivoal" href="mailto:florian@rivoal.net"> | 
|  | 7 <link rel="help" href="https://drafts.csswg.org/selectors-4/#focus-within-pseudo
    "> | 
|  | 8 <link rel="match" href="focus-within-001-ref.html"> | 
|  | 9 <meta name="flags" content="interact"> | 
|  | 10 <meta name="assert" content="Test that :focus-within applies to an element with 
    tabindex when :focus applies."> | 
|  | 11 <style> | 
|  | 12 /* Suppress things that cannot be reproduced in the reference file */ | 
|  | 13 :focus { | 
|  | 14   outline: none; | 
|  | 15 } | 
|  | 16 | 
|  | 17 /* Use blue to indicate that the user needs to pay attention. | 
|  | 18    This element needs to be focused for the test to make sense. */ | 
|  | 19 div { | 
|  | 20 border: solid 15px blue; | 
|  | 21 } | 
|  | 22 div:focus { | 
|  | 23 border-color: red; | 
|  | 24 } | 
|  | 25 div:focus-within { | 
|  | 26 border-color: green; | 
|  | 27 } | 
|  | 28 </style> | 
|  | 29 <p>Test passes if, when the element below is focused, it is surrounded by a thic
    k green border. There must be no red or blue once it is focused.</p> | 
|  | 30 <div id="focusme" class="reftest-wait" onfocus="this.classList.toggle('reftest-w
    ait');" tabindex="1">Focus this element</div> | 
|  | 31 <script> | 
|  | 32 /* This script is an optional convenience, | 
|  | 33    simply removing the need to manually focus the element. | 
|  | 34    The test is valid even if the script is not run. */ | 
|  | 35 var focusme = document.getElementById('focusme'); | 
|  | 36 focusme.focus(); | 
|  | 37 </script> | 
|  | 38 </html> | 
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