How Can I Create Angled Corners in CSS Without Using SVG or Canvas?

Angled Corners in CSS: A Cutting-Edge Technique

Designing an aesthetically pleasing website can be challenging, especially when it comes to creating angled corners. However, with the advancements in CSS, it's now possible to achieve this effect without resorting to non-native methods like SVG or canvas.

Creating the Angled Corner

To create an angled corner, we can leverage the :before and :after pseudo-elements along with a parent container. By manipulating the position, border styles, and offsets of these elements, we can effectively block out a corner while preserving the border.

Step 1: Container Border

Begin by adding a border to the container element to define the outer boundaries of our angled corner.

Step 2: :before Pseudo-Element

Next, add the :before pseudo-element to cut off the desired corner. Position it absolutely, with a negative offset of -1px to cover the border. Apply a solid border to the top and a transparent border to the right to create the slanted line.

Step 3: :after Pseudo-Element

To create the line inside the cut-off, add the :after pseudo-element with a slightly smaller offset of -2px. Give it a solid white border to the top and a transparent border to the right.

Example Implementation

The following CSS code demonstrates how to apply these principles:

.cutCorner {
    position:relative; background-color:blue; 
    border:1px solid silver; display: inline-block;
}

.cutCorner img {
    display:block;
}

.cutCorner:before {
    position:absolute; left:-1px; top:-1px; content:'';
    border-top: 70px solid silver;
    border-right: 70px solid transparent;
}

.cutCorner:after {
    position:absolute; left:-2px; top:-2px; content:'';
    border-top: 70px solid white;
    border-right: 70px solid transparent;
}

This code can be used to wrap an image element within a container, resulting in an image with the specified angled corner.

Alternative Approach

While CSS techniques can provide a solution, if precise control over the angled corner is required or additional features like masking or image clipping are desired, using SVG or canvas may be a more suitable approach.

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