How to create spoiler text? - html

Question

Hello I was wondering how to make spoiler text on a website with html/css. What I was is, text that is black with black background, but when hovered over, makes the black text turn white, making it visible.
like this
<span style="color: black; background: black;">test</span>
<p>Then when hovered over</p>
<span style="color: white; background: black;">test</span>

Answer 1

The <details> HTML tag was designed specifically for this purpose. Here is the example from the MDN docs. Unfortunately, IE and edge don't support this tag as of January 2019.
<details>
<summary>Details</summary>
Something small enough to escape casual notice.
</details>

Answer 2

.spoiler, .spoiler2{
color: black;
background-color:black;
}
.spoiler:hover{
color: white;
}
.spoiler2:hover {
background-color:white;
}
<span class="spoiler" >test</span>
<p>Then when hovered over</p>
<span class="spoiler2"> other test </span>

Answer 3

Similar to spoiler in Disqus comments.
.spoiler{
background-color: gray;
color: transparent;
user-select: none;
}
.spoiler:hover{
background-color: inherit;
color: inherit;
}
<h3>In the movie, <span class="spoiler">the hero kills his wife.</span></h3>

Answer 4

I have been spoilers on forums (including my own) that are not just text with the background color changed.
They have the content hidden until you click a show/hide toggle button.
I want to add a section to a site that doesn't show up by default to save space.
https://jsfiddle.net/clarle/bY7m4/
That seems like it will meet my needs.
HTML
<div class="forum-post">
Show spoiler
Hide spoiler
<div class="spoiler">
<p class="spoiler-content">People die when they are killed!</p>
</div>
</div>
CSS
.spoiler {
display: none;
}
.show {
display: none;
}
.hide:target + .show {
display: inline;
}
.hide:target {
display: none;
}
.hide:target ~ .spoiler {
display: inline;
}
/* Just for prettiness, not actually needed */
body {
margin: 0;
padding: 20px;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 14px;
line-height: 20px;
color: #333333;
background-color: #ffffff;
}
.btn {
padding: 4px 12px;
margin-bottom: 0;
*margin-left: .3em;
font-size: 14px;
line-height: 20px;
color: #333333;
text-align: center;
text-shadow: 0 1px 1px rgba(255, 255, 255, 0.75);
vertical-align: middle;
cursor: pointer;
background-color: #f5f5f5;
*background-color: #e6e6e6;
background-image: -moz-linear-gradient(top, #ffffff, #e6e6e6);
background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#ffffff), to(#e6e6e6));
background-image: -webkit-linear-gradient(top, #ffffff, #e6e6e6);
background-image: -o-linear-gradient(top, #ffffff, #e6e6e6);
background-image: linear-gradient(to bottom, #ffffff, #e6e6e6);
background-repeat: repeat-x;
border: 1px solid #bbbbbb;
*border: 0;
border-color: #e6e6e6 #e6e6e6 #bfbfbf;
border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
border-bottom-color: #a2a2a2;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffffff', endColorstr='#ffe6e6e6', GradientType=0);
filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
*zoom: 1;
-webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
-moz-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
text-decoration: none;
}
.forum-post {
padding: 20px;
border: 1px solid #000;
}
.spoiler-content {
padding: 15px;
}