uses a front-end framework called skel. The checkbox in the form form is not displayed and checked by F12. The code in the framework is as follows:
input[type="checkbox"],
input[type="radio"] {
-moz-appearance: none;
-webkit-appearance: none;
-ms-appearance: none;
appearance: none;
display: block;
float: left;
margin-right: -2em;
opacity: 0;
width: 1em;
}what does this mean? How to make checkbox display. I can"t even comment out this code.
opacity: 0; change to opacity: 1;
input[type="checkbox"],
input[type="radio"] {
-moz-appearance: checkbox;
-webkit-appearance: checkbox;
-ms-appearance: checkbox;
appearance: checkbox;
display: block;
float: left;
opacity: 1;
margin-right: -2em;
width: 1em;
}A timing examination system is triggered if the click event is triggered within 5 seconds, and if it is not triggered, the system marks the correct answer at the end of the countdown. How to implement ...
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