A form is a place where controls are placed, such as text boxes, password boxes, buttons, etc. These controls are called form elements.
Composition of the form:
<form action="提交地址">
表单内容（包括按钮，输入框，选择框等等）</form>The basic tag of the form element is the <input> tagits type attribute has the following types :
text: Text box
password: Password box
radio: Radio button
checkbox: Check box
reset: Reset button
button: Ordinary button
submit: Submit button, submit the form content to the web page set by the action
image: Picture
Sample code:
<body>
<form>
<h2 >欢迎注册</h2><br>
输入账号（文本框）：<input type="text" ><br>
输入密码（密码框）：<input type="password" ><br>
选择性别（单选按钮）：
<input type="radio" name="sex" checked="checked" >男
<input type="radio" name="sex" >女<br>
选择爱好（复选框）：
<input type="checkbox" >唱歌
<input type="checkbox" >跳舞
<input type="checkbox" checked>打球
<input type="checkbox" >打游戏<br>
<input type="submit" value="注册" />
<input type="reset" value="清空" />
<input type="button" value="普通按钮" />
</form>
</body>
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