Prompt Title: Style Placeholder in CSS.

To style the placeholder text of an input field in CSS, you can use the ::placeholder pseudo-element. You'll need to target different vendor prefixes for better cross-browser compatibility. Here's an example that demonstrates how to style the placeholder text:

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/* For most modern browsers */
input::placeholder {
  color: #999;
  font-style: italic;
  font-size: 16px;
}

/* For WebKit browsers (e.g., Chrome, Safari, etc.) */
input::-webkit-input-placeholder {
  color: #999;
  font-style: italic;
  font-size: 16px;
}

/* For Mozilla Firefox */
input::-moz-placeholder {
  color: #999;
  font-style: italic;
  font-size: 16px;
  opacity: 1; /* Firefox uses opacity for placeholder, so set it to 1 to make it fully visible */
}

/* For Microsoft Edge and Internet Explorer */
input:-ms-input-placeholder {
  color: #999;
  font-style: italic;
  font-size: 16px;
}

/* For Microsoft Edge */
input::-ms-input-placeholder {
  color: #999;
  font-style: italic;
  font-size: 16px;
}

This example will style the placeholder text of an input field with a gray color, italic font style, and a font size of 16px. Adjust the properties according to your design preferences.