# Self-drawing triangle

> A triangle outline that draws itself, changes color at the top of the loop and then empties again.

- Category: [Loaders](https://library.aimran.es/components/loaders)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/css-triangle
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

A triangle reads as a mountain, a roof or a play button depending on context, so this SVG loader suits an outdoor gear shop, the booking page of a mountain hut or the site of an architecture studio. The line draws itself, shifts color halfway and erases from where it started, all in CSS.

Clean, minimal layouts suit it best, since the single line needs room to breathe. For more presence, raise the size rather than the speed; a fast triangle looks more like a warning sign than a pause.

## Code

### HTML

```html
<svg class="ul-tri" viewBox="0 0 100 100"><path d="M50 12 L90 84 L10 84 Z" pathLength="100"/></svg>
```

### CSS

```css
.ul-tri {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 72px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --bg: #f5f5f7;
}

.ul-tri {
  width: var(--s);
  height: var(--s);
  overflow: visible;
}

.ul-tri path {
  fill: none;
  stroke: var(--c1);
  stroke-width: 8;
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-dasharray: 100;
  animation: ul-tri calc(2s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-tri {
  0% {
    stroke-dashoffset: 100;
  }
  50% {
    stroke-dashoffset: 0;
    stroke: var(--c2);
  }
  100% {
    stroke-dashoffset: -100;
  }
}
```

### React

```tsx
import type { CSSProperties } from "react";

const css = `
.ul-tri {
  width: var(--s);
  height: var(--s);
  overflow: visible;
}

.ul-tri path {
  fill: none;
  stroke: var(--c1);
  stroke-width: 8;
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-dasharray: 100;
  animation: ul-tri calc(2s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-tri {
  0% {
    stroke-dashoffset: 100;
  }
  50% {
    stroke-dashoffset: 0;
    stroke: var(--c2);
  }
  100% {
    stroke-dashoffset: -100;
  }
}
`;

export default function LoaderTriangle() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "72px",
          "--k": "1",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <svg className="ul-tri" viewBox="0 0 100 100"><path d="M50 12 L90 84 L10 84 Z" pathLength="100" /></svg>
      </div>
    </>
  );
}
```

## Prompt for AI assistants

Paste this into ChatGPT, Claude, Cursor, v0 or Lovable to adapt the block to your stack (Tailwind, Vue, Svelte…):

````text
I want to add the “Self-drawing triangle” block (Loaders) from AIMRAN Library to my project.

## What it is
A triangle outline that draws itself, changes color at the top of the loop and then empties again.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 72px (from 24 to 120px)
- Speed: 1x (from 0.5 to 2x)

## What I need
1. Add it to my project with the same look and animation as the reference code: same sizes, colours, radii, shadows, timings and easing.
2. It is built with plain HTML and CSS (the reference wraps it in a React component with its CSS). If my project uses something else (Vue, Svelte, Astro, plain HTML…), translate it without losing any behaviour. If I use Tailwind, turn the styles into classes; if not, keep the CSS in its own file.
3. Expose the settings above as props (or CSS variables) with those values as defaults.
4. Make it work well on phones: nothing that depends only on hover, touch targets of at least 44 px and no overflow on 320 px screens.
5. Make it look right in light and dark mode.
6. Keep it accessible: semantic HTML, roles and aria-* where needed, visible focus and keyboard support.
7. Respect prefers-reduced-motion: with reduced motion, no big animations but the same end result.

## Reference code
```tsx
import type { CSSProperties } from "react";

const css = `
.ul-tri {
  width: var(--s);
  height: var(--s);
  overflow: visible;
}

.ul-tri path {
  fill: none;
  stroke: var(--c1);
  stroke-width: 8;
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-dasharray: 100;
  animation: ul-tri calc(2s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-tri {
  0% {
    stroke-dashoffset: 100;
  }
  50% {
    stroke-dashoffset: 0;
    stroke: var(--c2);
  }
  100% {
    stroke-dashoffset: -100;
  }
}
`;

export default function LoaderTriangle() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "72px",
          "--k": "1",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <svg className="ul-tri" viewBox="0 0 100 100"><path d="M50 12 L90 84 L10 84 Z" pathLength="100" /></svg>
      </div>
    </>
  );
}
```

Give me the complete final code, ready to paste, and tell me in one line where to put it in my project.
````