Line-through input value, but not placeholder

I got a html input, and want to add a

text-decoration: line-through;

to the value (if validation fails, which sets a specific css class).

I don’t want that to appear on the placeholder though, which I tried to fix by adding a

input::placeholder {
   text-decoration: none; 
}

Unfortunately that doesn’t work.
Is there any way to achieve this?

>Solution :

Use :not(:placeholder-shown) to exclude the case when you have the placeholder

input.error:not(:placeholder-shown) {
  text-decoration: line-through;
}

<input type="text" placeholder="example" class="error">

<input type="text" placeholder="example">