polygon()

polygon() is a CSS basic shape function used to draw custom straight-edged shapes from a list of coordinate pairs. It is most commonly seen with clip-path, where it can crop an element into triangles, arrows, badges, angled sections, speech bubbles, and other geometric forms without extra images or SVG.

Each point in a polygon() defines a vertex, usually with percentage-based x y coordinates relative to the element’s box. That makes it especially useful for responsive designs, since the same shape can scale with its container while preserving its proportions.

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Beyond static clipping, polygon() can also be animated when matching point lists are used, enabling morphing panels, hover effects, and dynamic transitions. Its power comes with a few constraints, including coordinate ordering, browser behavior, accessibility concerns, and the need to plan fallbacks for unsupported or visually complex layouts.

What polygon() Is in CSS

polygon() is a CSS basic shape function used to describe a custom polygon with a list of coordinate pairs. Each pair represents one vertex of the shape, and the browser connects those points in order to form a closed area. The first and last points are connected automatically, so you do not need to repeat the first coordinate at the end unless doing so helps with animation or readability.

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The function is most commonly used with clip-path, where it clips an element to the polygon you define. For example, a rectangle can become a triangle, a slanted card, a badge, a diagonal hero banner, or a more complex decorative shape without needing an SVG file or extra markup. The element still occupies its original box in the document flow, but only the area inside the polygon is painted and interactive in many modern browsers.

A polygon is defined relative to a reference box, usually the border box of the element when used with clip-path. Coordinates are written as horizontal and vertical positions, such as 0 0, 100% 0, and 50% 100%. Percentages are especially useful because they scale with the element, making the shape responsive by default.

.triangle {
clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

In that example, the first point sits at the horizontal center of the top edge, the second at the bottom-right corner, and the third at the bottom-left corner. Connected together, those points form a triangle. The same idea can create a wide range of shapes by changing the number and placement of points.

polygon() belongs to the CSS Shapes family of functions, alongside shapes such as circle(), ellipse(), and inset(). With clip-path, it controls visual clipping. In shape-related layouts, such as shape-outside, it can also define the contour that inline content flows around, although that use has different layout requirements and is most often applied to floated elements.

• For clipping: clip-path: polygon(...) changes the visible painted area of an element.
• For text flow: shape-outside: polygon(...) can make text wrap around a custom polygonal outline.
• For responsive design: percentage coordinates let the polygon adapt to changing element dimensions.
• For motion: polygons with matching point counts can be animated or transitioned between states.

Because polygon() is purely declarative CSS, it is well suited for interface details that need to remain lightweight: angled image masks, callout panels, hover reveals, section dividers, and geometric UI accents. It gives designers precise control over hard-edged shapes while keeping the shape tied to the element’s own dimensions rather than to a fixed image asset.

Syntax and Coordinate Rules

The CSS polygon() function defines a shape as a list of points. Each point is written as an x y coordinate pair, and the browser connects those points in order to form the polygon boundary. The first and last points are automatically connected, so you do not need to repeat the starting coordinate at the end.

The basic syntax is:

polygon(x1 y1, x2 y2, x3 y3, ...)

For example, a triangle can be described with three points:

clip-path: polygon(50% 0%, 100% 100%, 0% 100%);

In this example, 50% 0% places the first point at the horizontal center of the top edge, 100% 100% places the second point at the bottom-right corner, and 0% 100% places the third point at the bottom-left corner. The browser draws straight lines between these points to create the triangular clipping shape.

Coordinate pairs

Each coordinate pair uses the same order as many CSS positioning systems: the first value is the horizontal position, and the second value is the vertical position. In other words, 0% 0% is the top-left corner, 100% 0% is the top-right corner, 100% 100% is the bottom-right corner, and 0% 100% is the bottom-left corner.

Allowed units

Coordinates can use percentages, lengths, or calculated values. Percentages are the most common because they scale with the element’s box, which makes the shape responsive by default. Pixel values are useful for fixed notches, angled corners, or decorative cuts that should remain the same size regardless of the element’s dimensions.

clip-path: polygon(20px 0, 100% 0, 100% 100%, 0 100%, 0 20px);

This creates a shape with a fixed diagonal cut near the top-left corner. Mixed units are valid, so a polygon can combine px, %, em, rem, or calc() where appropriate:

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clip-path: polygon(
0 0,
calc(100% - 2rem) 0,
100% 2rem,
100% 100%,
0 100%
);

Point order matters

The order of points controls how the polygon is drawn. A clean shape usually follows the edge of the element in a clockwise or counterclockwise direction. If points jump across the shape, the polygon can self-intersect, producing unexpected clipped areas. For maintainable shapes, list points as if tracing the outline with a pen.

• Use at least three points to create a visible polygon.
• Separate points with commas, and separate x/y values with whitespace.
• Prefer percentages for shapes that should scale with the element.
• Use consistent point counts when preparing polygons for animation.

Coordinates are not limited to the visible bounds of the element. Values below 0% or above 100% can push points outside the box, which is useful for oversized angles or dramatic transitions. However, when polygon() is used with clip-path, anything outside the resulting clipped region is hidden, so out-of-range points should be tested carefully across different element sizes.

Using `polygon()` with `clip-path`

The most common use of polygon() is with the CSS clip-path property. This lets you cut an element into a custom visible shape while keeping the original box model intact. The element still occupies its rectangular layout space, but only the area inside the polygon is painted. That makes it useful for angled hero sections, diagonal image crops, badges, cards, thumbnails, and decorative UI panels.

A basic clipped element might use four coordinate pairs to create a slanted edge. Each point is placed relative to the element’s own border box, unless another geometry box is specified. The browser connects the points in order, then closes the shape automatically from the last point back to the first:

.hero-image {
clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
}

In this example, the top edge remains straight, the right side runs down to 85% of the element’s height, and the bottom-left corner stays at 0 100%. The result is a diagonal lower edge. Because the coordinates use percentages, the crop scales with the element as it changes size.

Clipping images and blocks

clip-path: polygon() works especially well on images because the visual result is immediate and does not require extra wrapper elements. For example, a profile image can be clipped into a hexagon-like shape:

.avatar {
width: 180px;
aspect-ratio: 1;
object-fit: cover;
clip-path: polygon(
25% 5%,
75% 5%,
100% 50%,
75% 95%,
25% 95%,
0 50%
);
}

The same approach can be applied to regular layout containers. A card can have a cut corner, a banner can have a pointed end, or a section background can be clipped into a dynamic diagonal shape. The content inside the element is clipped too, so text, images, backgrounds, borders, and descendants are all visually restricted to the polygon area.

Practical behavior to account for

• Layout remains rectangular: clipping changes what is visible, not how surrounding elements flow around it.
• Hit testing usually follows the clipped shape: pointer interaction is typically limited to the visible clipped area in modern browsers.
• Borders are not reshaped: a normal border still belongs to the rectangular box and may be clipped. Use SVG, pseudo-elements, or layered shapes for precise polygon borders.
• Overflow is effectively hidden: anything outside the polygon is not painted.

For decorative section cuts, it is often safer to apply clip-path to a background or pseudo-element rather than the content container itself. This avoids accidentally clipping headings, buttons, focus outlines, dropdowns, or shadows. For example, a ::before element can provide the angled background while the actual content remains fully accessible and readable.

.section {
position: relative;
}

.section::before {
content: "";
position: absolute;
inset: 0;
background: linear-gradient(135deg, #2563eb, #7c3aed);
clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
z-index: -1;
}

When using polygon() with clip-path, prefer clear point ordering and percentage-based coordinates for scalable shapes. Test the clipped element at narrow and wide viewport sizes, especially when the shape affects content or interactive controls.

Creating Common Shapes with `polygon()`

Once the coordinate format is clear, polygon() becomes a practical way to build reusable CSS shapes without SVG or extra markup. Most common shapes are made by placing points around the edges of the element’s box, usually with percentages so the shape scales with the element. The examples below are designed for clip-path, but the same coordinate thinking applies anywhere a CSS basic shape is accepted.

Triangles, diamonds, and parallelograms

A triangle needs only three points. For example, a downward-pointing triangle starts at the top-left corner, moves to the top-right corner, then ends at the middle of the bottom edge. A diamond uses four points centered on each side of the box. A parallelogram shifts the top and bottom edges in opposite directions, which is useful for angled cards, buttons, labels, and hero panels.

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• Down triangle: clip-path: polygon(0 0, 100% 0, 50% 100%);
• Up triangle: clip-path: polygon(50% 0, 100% 100%, 0 100%);
• Diamond: clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
• Parallelogram: clip-path: polygon(15% 0, 100% 0, 85% 100%, 0 100%);

These shapes work best when the element has a defined size, either through explicit dimensions, an aspect ratio, padding, or content that establishes height. For instance, a clipped button may need extra horizontal padding because the angled sides remove some visual space from the left and right edges. With image thumbnails or cards, aspect-ratio helps keep the polygon predictable across different viewport widths.

Trapezoids, chevrons, and cut-corner panels

Four or more points can create interface-friendly shapes that still feel geometric and controlled. A trapezoid is often used for tabs or banners because one edge can be wider than the other. A chevron is useful for step indicators, breadcrumbs, and directional callouts. Cut-corner panels create a tech-style frame while keeping most of the original rectangular area available for text and images.

• Trapezoid: clip-path: polygon(10% 0, 90% 0, 100% 100%, 0 100%);
• Right chevron: clip-path: polygon(0 0, 85% 0, 100% 50%, 85% 100%, 0 100%, 15% 50%);
• Left-pointing tag: clip-path: polygon(15% 0, 100% 0, 100% 100%, 15% 100%, 0 50%);
• Cut corners: clip-path: polygon(8% 0, 92% 0, 100% 8%, 100% 92%, 92% 100%, 8% 100%, 0 92%, 0 8%);

For more complex shapes, list the points in order around the perimeter, either clockwise or counterclockwise. Crossing lines can produce unexpected filled areas, especially when a shape folds back over itself. It is usually easier to start with a rectangle, then replace individual corners or edges with additional points. For example, a cut-corner rectangle begins as four corners, then each corner becomes two points inset along the adjacent edges.

Practical shape patterns

When clipping content-heavy elements, remember that clip-path changes the visible area, not the document flow. Text, buttons, and focus outlines can still sit inside clipped-off regions unless spacing is adjusted. A safe pattern is to use polygon() on a wrapper, pseudo-element, or decorative media layer, while keeping readable content in an unclipped inner container with enough padding to avoid the trimmed edges.

Responsive and Percentage-Based Polygons

Percentage coordinates are what make polygon() especially useful in responsive designs. Instead of tying vertices to fixed pixel positions, each coordinate can be expressed relative to the clipped element’s own box. In polygon(0 0, 100% 0, 100% 80%, 0 100%), for example, the top edge spans the full width, while the lower-right point sits at 80% of the element’s height. If the element becomes wider, taller, or narrower, the same shape scales with it.

This relative coordinate system makes angled cards, diagonal hero sections, slanted image masks, and decorative panels easier to maintain across viewport sizes. A common responsive pattern is to clip a section so its bottom edge slopes downward:

clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);

Because all four points are percentage-based, the shape adapts to different section dimensions without media queries. On a tall mobile layout, the diagonal will stretch vertically; on a wide desktop layout, it will span a broader horizontal distance. This can be desirable for fluid visual rhythm, but it also means the angle changes as the element’s aspect ratio changes.

Managing Shape Distortion

Responsive polygons scale with the element, not the viewport directly. That distinction matters when the shape is applied to images, cards, or banners whose aspect ratios vary. A chevron that looks balanced in a wide desktop card may become too sharp in a narrow mobile card. A decorative notch that appears subtle at 1200px wide may become visually dominant at 320px.

To keep shapes consistent, combine percentage-based polygons with layout constraints. For media-heavy components, set an expected aspect ratio with aspect-ratio. For hero areas, use min-height, max-height, or fluid sizing with clamp(). These properties keep the clipped box within predictable proportions, which gives the polygon a more stable appearance.

• Use percentages for fluid shapes that should scale with the element.
• Use aspect-ratio when the visual angle or silhouette needs to stay predictable.
• Use media queries when a shape needs different coordinates on small screens.
• Avoid tiny details in polygons that will be rendered on very small elements.

Combining Percentages with Fixed Offsets

Although many polygons use only percentages, CSS math functions can make responsive shapes more controlled. For example, calc() can define a point that is mostly responsive but includes a fixed inset: polygon(0 0, 100% 0, 100% calc(100% - 2rem), 0 100%). This keeps the lower-right point two rem units above the bottom edge, regardless of the element’s height.

This approach is useful for consistent cuts, tabs, and notches. A card might use polygon(0 0, 100% 0, 100% 100%, 2rem 100%, 0 calc(100% - 2rem)) to create a clipped lower-left corner with a stable visual size. The rest of the shape remains fluid, while the decorative detail avoids becoming exaggerated on large components or disappearing on small ones.

Testing Across Breakpoints

Percentage-based polygons should be checked at the smallest and largest sizes where the component appears. Look for overlapping points, overly steep diagonals, clipped text, and interactive elements positioned near cut edges. Since clip-path clips both visual content and hit testing in most modern browsers, links or buttons placed outside the visible polygon may become difficult or impossible to interact with.

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For content containers, keep the polygon decorative and preserve safe internal spacing with padding. If the clipped edge is on the bottom, add enough bottom padding so text never runs into the diagonal. If the clipped edge is on the side, use layout spacing or an inner wrapper so the content remains inside a rectangular safe area while the outer element carries the polygon effect.

Animating Polygon Shapes

CSS polygon() shapes can be animated when they are used in properties such as clip-path. This makes it possible to morph an element from one clipped shape to another, such as changing a rectangle into a diagonal banner, revealing an image with a wipe effect, or turning a card mask into a more complex geometric shape on hover. The animation happens by interpolating the coordinate pairs inside the polygon() function.

For polygon animation to work reliably, the starting and ending polygons should have the same number of points. The browser matches the first coordinate pair in the first polygon with the first coordinate pair in the second polygon, then interpolates each pair in order. If one shape has four points and the other has six, interpolation may fail or jump abruptly. A common pattern is to add extra duplicate points to the simpler shape so both polygons contain the same number of vertices.

Hover morph example

This example clips an image-like card into a rectangle by default, then morphs it into an angled shape when the user hovers over it:

.card {
width: 320px;
height: 220px;
background: url("image.jpg") center / cover;
clip-path: polygon(
0 0,
100% 0,
100% 100%,
0 100%
);
transition: clip-path 400ms ease;
}

.card:hover {
clip-path: polygon(
8% 0,
100% 0,
92% 100%,
0 100%
);
}

The first polygon is a standard rectangle with four corners. The hover state keeps four coordinate pairs, but shifts the left and right edges inward to create a slanted panel. Because the number and order of points match, the transition is smooth and predictable.

More complex morphing

When morphing between shapes with different visual complexity, keep the coordinate count equal by repeating points. For example, a triangle can be represented with four points by duplicating one vertex, allowing it to animate into a four-sided diamond-like shape:

.shape {
width: 240px;
height: 240px;
background: linear-gradient(135deg, #6d5dfc, #00c2ff);
clip-path: polygon(
50% 0,
100% 100%,
0 100%,
50% 0
);
animation: morph 3s ease-in-out infinite alternate;
}

@keyframes morph {
to {
clip-path: polygon(
50% 0,
100% 50%,
50% 100%,
0 50%
);
}
}

The repeated top point in the initial triangle gives the animation four vertices, matching the diamond shape in the final keyframe. This avoids a mismatch and gives the browser a clear path for each coordinate during the morph.

Practical animation considerations

• Keep point order consistent: arrange points clockwise or counterclockwise in both states to avoid twisting or folding effects.
• Use percentages for responsive motion: percentage coordinates scale with the element, making the animation adapt to different sizes.
• Avoid excessive point counts: very detailed polygons can be harder to maintain and may cost more to animate, especially on large elements.
• Test across browsers: simple clip-path: polygon() transitions are widely usable, but complex animated clipping can still show rendering differences.
• Respect reduced motion preferences: provide a static or simplified version for users who prefer less animation.

For interface work, polygon animation is most effective when it supports a clear interaction: a hover reveal, a section transition, an image mask, or a decorative entrance effect. Keeping the geometry simple, matching vertex counts, and using percentage-based coordinates will make the result smoother and easier to maintain.

Browser Support and Practical Pitfalls

The CSS polygon() function is well supported in modern browsers when used with clip-path, including current versions of Chrome, Edge, Firefox, Safari, and mobile browsers. In practice, most production issues come less from the function itself and more from how it is applied: clipped elements still keep their original box, browser rendering can vary at sharp edges, and some older browser versions require extra care. If the shape is decorative, it is usually safe to use polygon() with a sensible fallback. If it controls access to content or interaction, test more carefully.

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For older Safari and some legacy WebKit-based browsers, the prefixed property -webkit-clip-path may still be useful. A common production pattern is to declare both forms, with the prefixed version first and the standard version second:

.card {
-webkit-clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
}

Fallbacks should be designed around the unclipped rectangle. Since clip-path only changes what is painted, not the element’s layout dimensions, surrounding content behaves as if the element were still rectangular. This can surprise you when creating diagonal sections, angled cards, or image masks: the clipped-off area may still create whitespace. Use margins, negative margins, padding adjustments, or wrapping elements to align the visual shape with the surrounding layout.

Common pitfalls

• Hit testing can be inconsistent: modern browsers generally restrict pointer interaction to the visible clipped area, but behavior has varied historically. Test buttons, links, and hover states inside complex clipped shapes.
• Text should not depend on clipping: clipping can hide words, focus outlines, or form controls. Keep readable content inside a safe rectangular area unless the clipped shape is purely decorative.
• Focus indicators may be cut off: keyboard focus rings on links or buttons can be clipped by a parent shape. Add inner focus styles or extra padding for accessible navigation.
• Anti-aliasing artifacts may appear: diagonal edges can show thin seams, especially over contrasting backgrounds or during transforms. Slightly overlap adjacent shapes or match background colors to reduce visible gaps.
• Animations need matching point counts: interpolating between polygons works best when both shapes use the same number of coordinate pairs in the same order.

Browser support also differs depending on where polygon() is used. It is most common and reliable with clip-path on HTML elements. Shape-related layout features such as shape-outside: polygon(...) have narrower usage constraints: they apply to floated elements and influence inline content flow rather than clipping the element visually. For shape-outside, you typically need a defined size and a float, such as float: left, otherwise the polygon will not affect surrounding text as expected.

When building robust components, combine feature queries with graceful defaults. For example, start with a normal rectangular image or card, then enhance it only when clipping is supported:

.hero-image {
border-radius: 1rem;
}

@supports (clip-path: polygon(0 0, 100% 0, 100% 100%)) {
.hero-image {
border-radius: 0;
clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
}
}

Finally, keep performance in mind. Static polygons are usually cheap, but animating large clipped elements, high-resolution images, or many polygon points can increase paint work. Prefer simple shapes, limit animations to a few elements, and test on mid-range mobile devices. Used with these constraints in mind, polygon() is a dependable tool for creating custom visual geometry without SVG or extra markup.

Frequently Asked Questions

Can I use CSS polygon() by itself, or does it need another property?

polygon() is a shape function, so it needs to be used inside a property that accepts basic shapes, most commonly clip-path. For example, clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%) clips an element to a rectangle. It can also be relevant for shape-related layout features such as shape-outside, though browser behavior and use cases differ.

Do polygon() coordinates use the element’s size or the page size?

Percentage coordinates in polygon() are relative to the reference box of the element, usually the element’s border box when used with clip-path. A point like 100% 50% means the far right edge and halfway down the element, not the viewport or document. This makes percentage-based polygons naturally responsive as the element changes size.

Why is my clipped shape cutting off shadows, borders, or content?

clip-path clips the rendered element, including backgrounds, borders, child content, and visual effects such as shadows. If you need a shadow around a clipped shape, apply the shadow to a wrapper element or use an SVG/filter-based approach instead. For text or controls, make sure the polygon does not clip interactive content on smaller screen sizes.

Can I animate between two polygon() shapes?

Yes, but the starting and ending polygons should have the same number of points for smooth interpolation. For example, animating a triangle to a pentagon usually requires both shapes to be written with five coordinate pairs, with repeated points where needed. Browser support for clip-path animation is good in modern browsers, but testing is still needed for complex shapes and mobile performance.

Does polygon() work in all browsers?

polygon() with clip-path is supported in modern Chrome, Edge, Firefox, and Safari, but older browsers may have partial or missing support. Some Safari versions have had quirks with clipping, animation, and prefixed syntax, so test real devices if the shape is central to the design. For critical content, provide a safe fallback such as a normal rectangle or background image.

Bottom Line

polygon() is a flexible way to draw custom CSS shapes with coordinate pairs, most often for clip-path effects and shape-aware layouts. By thinking in percentages, testing responsive breakpoints, and keeping shapes simple when possible, you can create sharp visual treatments without relying on extra images or SVGs.

Use it for angled hero sections, badges, reveals, masks, and animated transitions, but verify browser behavior, accessibility, and fallback styles before shipping. Your next step is to start with a basic triangle or diagonal crop, then refine the points until the shape works across the sizes your design needs.

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