28 CSS Input Fields07 / 28

Pure CSSMIT licensed

Inline Validation

Live `:valid` / `:invalid` feedback. Green tick when correct, red cross when not — driven by `:has()` and pseudo-elements, no JavaScript required.

Published

Live Demo
Try it

The code

<label class="if-07">
  <span class="if-07-label">Email</span>
  <span class="if-07-wrap">
    <input type="email" name="email" autocomplete="email" placeholder="name@company.com" required />
  </span>
  <span class="if-07-help">We'll never share your address.</span>
</label>
.if-07 {
  display: grid;
  gap: 6px;
  width: 100%;
  max-width: 280px;
  font-size: 11px;
  color: #b8b6d4;
}

.if-07-label {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.if-07-wrap {
  position: relative;
  display: block;
}

.if-07 input {
  width: 100%;
  box-sizing: border-box;
  padding: 11px 38px 11px 14px;
  background: #1a1a22;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: #f0eeff;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}

.if-07 input:focus {
  border-color: #7c6cff;
}

.if-07-wrap::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%) scale(0.5);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  opacity: 0;
  transition: transform 0.2s, opacity 0.2s, background 0.2s;
}

.if-07:has(input:not(:placeholder-shown):invalid) input {
  border-color: rgba(239, 68, 68, 0.55);
}

.if-07:has(input:not(:placeholder-shown):invalid) .if-07-wrap::after {
  opacity: 1;
  transform: translateY(-50%) scale(1);
  background: #ef4444 url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10' fill='none' stroke='white' stroke-width='1.6' stroke-linecap='round'><path d='M2 2 L8 8 M8 2 L2 8'/></svg>") center/10px no-repeat;
}

.if-07:has(input:not(:placeholder-shown):valid) input {
  border-color: rgba(34, 197, 94, 0.55);
}

.if-07:has(input:not(:placeholder-shown):valid) .if-07-wrap::after {
  opacity: 1;
  transform: translateY(-50%) scale(1);
  background: #22c55e url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'><path d='M2 5 L4.2 7.2 L8 3'/></svg>") center/10px no-repeat;
}

.if-07-help {
  font-size: 10.5px;
  color: #b8b6d4;
}
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS Input Field from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: Inline Validation
Source: https://codefronts.com/components/css-input-fields/inline-validation/

Live `:valid` / `:invalid` feedback. Green tick when correct, red cross when not — driven by `:has()` and pseudo-elements, no JavaScript required.
## HTML
```html
<label class="if-07">
  <span class="if-07-label">Email</span>
  <span class="if-07-wrap">
    <input type="email" name="email" autocomplete="email" placeholder="name@company.com" required />
  </span>
  <span class="if-07-help">We'll never share your address.</span>
</label>
```
## CSS
```css
.if-07 {
  display: grid;
  gap: 6px;
  width: 100%;
  max-width: 280px;
  font-size: 11px;
  color: #b8b6d4;
}

.if-07-label {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.if-07-wrap {
  position: relative;
  display: block;
}

.if-07 input {
  width: 100%;
  box-sizing: border-box;
  padding: 11px 38px 11px 14px;
  background: #1a1a22;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: #f0eeff;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}

.if-07 input:focus {
  border-color: #7c6cff;
}

.if-07-wrap::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%) scale(0.5);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  opacity: 0;
  transition: transform 0.2s, opacity 0.2s, background 0.2s;
}

.if-07:has(input:not(:placeholder-shown):invalid) input {
  border-color: rgba(239, 68, 68, 0.55);
}

.if-07:has(input:not(:placeholder-shown):invalid) .if-07-wrap::after {
  opacity: 1;
  transform: translateY(-50%) scale(1);
  background: #ef4444 url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10' fill='none' stroke='white' stroke-width='1.6' stroke-linecap='round'><path d='M2 2 L8 8 M8 2 L2 8'/></svg>") center/10px no-repeat;
}

.if-07:has(input:not(:placeholder-shown):valid) input {
  border-color: rgba(34, 197, 94, 0.55);
}

.if-07:has(input:not(:placeholder-shown):valid) .if-07-wrap::after {
  opacity: 1;
  transform: translateY(-50%) scale(1);
  background: #22c55e url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'><path d='M2 5 L4.2 7.2 L8 3'/></svg>") center/10px no-repeat;
}

.if-07-help {
  font-size: 10.5px;
  color: #b8b6d4;
}
```

How this works

Constraint validation runs natively against the type="email" and required attributes. :has(input:not(:placeholder-shown):valid) on the label matches once the user has typed something valid; the same pattern with :invalid flags the error state. The tick or cross is a single ::after pseudo-element with an inline SVG data-URI background.

Gating on :not(:placeholder-shown) keeps the indicator hidden while the field is empty, so pure-CSS form validation without JavaScript still feels forgiving — no red cross the moment the input mounts.

Make it yours

  • Change the trigger rule by swapping required for a pattern attribute — regex, min-length, and type="url" all feed :valid.
  • Replace the SVG data-URI in the ::after background to swap tick and cross for your own icons.
  • Retint the success and error states via the #22c55e and #ef4444 colours in both border and icon backgrounds.
  • Slow the reveal by adjusting the shared transition on ::after (currently 0.2s on transform, opacity, background).

Gotchas — read before shipping

  • Because the trigger is :not(:placeholder-shown), the placeholder attribute must be non-empty — a whitespace " " works if you want no visible placeholder.
  • :invalid matches before the user interacts; the :user-invalid pseudo-class fires only after a blur or submit and is a better UX signal if you can require Chrome 119+ and Safari 16.5+.
  • :has() gates the whole effect — Chrome 105, Safari 15.4, Firefox 121. Older browsers show a plain field with no indicator, which degrades cleanly.

Browser support

ChromeSafariFirefoxEdge
105+15.4+121+105+

:has() is the floor; the fallback is an unindicated but fully functional field.

Search CodeFronts

Loading…

↑↓ navigate↵ selectesc closeOpen full search page →