Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Create a Flag With CSS

DZone's Guide to

Create a Flag With CSS

Corner flags are a nice way of labeling an image to emphasize something is 'new', 'featured' or 'on offer'. Often these effects are done with images. This tutorial gives an example of how to achieve this using CSS and semantic HTML.

· Web Dev Zone ·
Free Resource

Bugsnag monitors application stability, so you can make data-driven decisions on whether you should be building new features, or fixing bugs. Learn more.

Corner flags are a nice way of labelling an image to emphasise something is 'new', 'featured' or 'on offer'. Often these effects are done with images. This tutorial gives an example of how to achieve this using CSS and semantic HTML.

Demo: Image flag

Example HTML

Our markup is straightforward and semantic. Requiring two elements: one for the corner flag and the other for the text.

<p><span>Popular</span></p>

The flag is positioned absolutely so just needs to be contained to achieve the correct results.

<article>
    <img src="bacon.jpg"/>
    <h2>Some title</h2>
    <p><span>New!</span></p>
</article>

Example Code

/**
 *   Flag component
 */

.flag {
    position: absolute;
    top: 0;
    left: 0;
}

/**
 * The traingle shape of the flag.
 * 1. The size of the triangle.
 */  
.flag:before { 
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    border-style: solid;
    border-width: 34px;     /* [1] */
}

/*
 * Rotate the text and position it.
 * 1. Put on the GPU to ensure the text is rendered correctly
 */
.flag-text {
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg) translateZ(0);    /* [1] */
    transform: rotate(-45deg) translateZ(0);
    color: #FFF;
    display: inline-block;
    position: absolute;
    top: 18px;
    left: 0;
    z-index: 1;
    font-size: 12px;
    text-transform: uppercase;
    width: 50px;
    text-align: center;
}

/*
 * Modifier classes for different colour flags
 */
.flag.is-new:before {
    border-color: rgba(4,120,0,.9) transparent transparent rgba(4,120,0,.9);
}

.flag.is-popular:before {
    border-color: rgba(206,3,5,.7) transparent transparent rgba(206,3,5,.7);
}

Monitor application stability with Bugsnag to decide if your engineering team should be building new features on your roadmap or fixing bugs to stabilize your application.Try it free.

Topics:
image ,css ,markup ,flags ,html ,example

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}