请在此处检查小提琴 - http://jsfiddle.net/ghxce8dr/
它工作正常。我为两个div都添加了< p>< / p> 。

 < div id =welcomename> 
< h1>欢迎！你叫什么名字？< / h1> 
< input type =textclass =formname =nameplaceholder =您的名字在这里！ ID = 名称/&GT; 
< input type =buttononclick =clicked（）; value =我准备好了！/> 
< / div> 
< p>< / p> 
第一次休息后的文本
< div id =hiddenDiv> 
< h1 id =welcomehowareyou>你今天过得怎样？< / h1> 
< select name =moodonchange =popup（this.options.selectedIndex）> 
< option value =禁用选择>你好吗？< / option> 
< option>我做得很好，谢谢！< / option> 
< option>我很好，但可能会更好< / option> 
< option>今天感觉绝对糟糕。< / option>< / select> 
<！ - < input type =submitvalue =Done！/>  - > 
< p>< / p> 
第二次休息后的文本
< / div> 
 

希望这会对您有所帮助。

I have this HTML code:

<div id="welcomename">
    <h1>Welcome! What's your name?</h1>
    <input type="text" class="form" name="name" placeholder="Your name here!" id="name"/>
    <input type="button" onclick="clicked();" value="I'm ready!"/>
</div>
<br>

That works absolutely perfectly, but I for reasons, I need that <br> inside the div 'welcomename'. When I do this though, it doesn't work.

Other code:

<div id="hiddenDiv" style="display: none;">
    <h1 id="welcomehowareyou">How are you today, ?</h1>
    <form id="welcomehowareyou2" method="post">
        <select name="mood" onchange="popup(this.options.selectedIndex)">
            <option value="" disabled selected>How are you?</option>
            <option>I'm doing great, thanks!</option>
            <option>I'm fine, but could be better</option>
            <option>I feel absolutely terrible today.</option>
            <!--<input type="submit" value="Done!"/>-->
    </form>
    <p></p>
</div>

Please check with fiddle here - http://jsfiddle.net/ghxce8dr/ It is working fine. I added <p></p> for both div.

<div id="welcomename">
    <h1>Welcome! What's your name?</h1>
    <input type="text" class="form" name="name" placeholder="Your name here!" id="name"/>
    <input type="button" onclick="clicked();" value="I'm ready!"/>
</div>
<p></p>
Text After First Break
<div id="hiddenDiv">
    <h1 id="welcomehowareyou">How are you today, ?</h1>
    <select name="mood" onchange="popup(this.options.selectedIndex)">
            <option value="" disabled selected>How are you?</option>
            <option>I'm doing great, thanks!</option>
            <option>I'm fine, but could be better</option>
        <option>I feel absolutely terrible today.</option></select>
            <!--<input type="submit" value="Done!"/>-->    
    <p></p>
        Text After Second Break
</div>

Hope this will help you.