Hide all text except for the first letter with CSS

问题:

Is it possible to hide all letters after the first letter with CSS?

dt:not(::first-letter) {
  display: none;
}

回答1:

You can, but your CSS is wrong. The version below works (at least in Chrome). It makes the dt invisible, and defines an overrule for the first letter to make it visible again.

I tried the same with display too, but that doesn't work, as expected. visibility: hidden hides the content, but keeps the element in place, while display: none removes it from the flow, and makes it impossible for sub-elements (the first letter in this case) to become visible again.

I added a hover too, so you can hover the letter to see the rest of the dt.

dt {
  visibility: hidden;
}
dt::first-letter {
  visibility: visible;
}

/* Hover the first letter to see the rest */
dt:hover {
  visibility: visible;
}

Hover to see the rest:
<dt>Lorum ipsum is a weird text</dt>
<dt>Foo bar</dt>

A side effect will be that the area that is covered by the text is still claimed. Maybe that is not an issue, but if it is you will need some other solution. One possibility is to make the font-size of the dt 0 too. That way, the text is so small that is claims no space. Won't help if it also contains images, of course.

Since it doesn't seem to work, here is the alternative using font-size. Less than ideal, but hopefully it will still solve your problem.

dt {
  font-size: 0;
}
dt::first-letter {
  font-size: 1rem;
}

/* Hover the first letter to see the rest */
dt:hover {
  font-size: 1em;
}

Hover to see the rest:
<dt>Lorum ipsum is a weird text</dt>
<dt>Foo bar</dt>

回答2:

I think you can try this:

.twitter{
      display: block;
      color: transparent;
    }

    .twitter:first-letter{
      color: #000;
    }

 <div id="socialMedia">
    <a class="twitter">Twitter</a>
</div>
<div id="socialMedia">
    <a class="twitter">Google</a>
</div>

See also this fiddle

回答3:

You cannot use :not with pseudo element selector (see this).

What you can do is thinking in another way: transparent-ize the whole thing, then color with ::first-letter. Because the latter has higher specificity, it will override the transparent setting, thus achieve the result you want.

回答4:

An alternative based on Waruna's answer, using color instead of layout-based attributes. Main advantage is that it works on every browser I tested (Firefox, Chrome and M$ Edge, but should probably work on all browsers), and it does not cause any visual glitches (like the "baseline jumping a pixel" from the second solution of the accepted answer), since it uses a completely visual attribute.

The issue with your original CSS is that you cannot use pseudo-elements (::blah) inside :not. You have to expand it into the inverse logic so you do not need the :not

dt {
  color: transparent;
}
dt::first-letter {
  color: black;
}

/* For testing */
dt:hover {
  color: black;
}

<dt>Hello World!</dt>

回答5:

Try this....

.newline1::first-letter {
    font-size: 200%;
    color: #8A2BE2;
}
.newline2::first-letter {
  /*color: transparent;*/
font-size: 0px;
}

<div class="newline1">
Test Stackoverflow.com
</div>
<div class="newline2">
Test Stackoverflow.com
</div>

.newline1::first-letter {
    font-size: 200%;
    color: #8A2BE2;
}
.newline2::first-letter {
  color: transparent;
}

<div class="newline1">
Test Stackoverflow.com
</div>
<div class="newline2">
Test Stackoverflow.com
</div>