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I originally thought that span was different from input, and event bubbling would be swallowed up by the parent tag. I wrote a demo to test event bubbling, but found that it was not what I thought. In addition: event.stopPropagation() and event.stopImmediatePropagation() cannot prevent span from bubbling into the a tag, but the simple and crude return false can.
<!DOCTYPE html> <html> <head> <title>Bubbling</title> <style type="text/css"> * { font-size:30px; } div { border: 1px blue solid; } span { border: 1px blue solid; } </style> <script type="text/javascript"> function setforeColor(sender) { sender.style.color = "red"; } function setbgColor(sender) { sender.style.background = "green"; return false; } </script> </head> <body> <div> <span onclick="setforeColor(this)">span tag</span> in div </div> <br> <div> <input type="button" value="Button" onclick="setforeColor(this)"/> in div </div> <br> <a href="https://www.baidu.com" style="text-decoration:none;display:block;"> <span onclick="setforeColor(this);return false">span tag</span> in anchor </a> <br> <a href="https://www.baidu.com" style="text-decoration:none;display:block;"> <span onclick="setbgColor(this)">span tag</span> in anchor </a> </body> </html>
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