input checkbox checked html code example

Example 1: how to set checkbox checked

<input type="checkbox" name="vehicle3" value="Boat" checked>

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Example 2: html checkbox default checked

<!-- Add checked tag  -->
<input type="checkbox" name="vehicle3" value="Boat" checked>

Example 3: fill checkbox javascript

// Check
document.getElementById("checkbox").checked = true;

// Uncheck
document.getElementById("checkbox").checked = false;