Check Radio Buttons and Checkboxes by Default - zilongxuan001/LearnFreecode GitHub Wiki
为单选按钮和复选框设置默认选项，关键词为checked，在<input>中设置
在HTML中样式如下
<form action="/submit-cat-photo">
<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
<label><input type="checkbox" name="personality" checked> Loving</label>
<label><input type="checkbox" name="personality"> Lazy</label>
<label><input type="checkbox" name="personality"> Energetic</label>
<input type="text" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>
在浏览器中显示如下
