Is this mountain-shaped mark that you often see on the web content an image?Text?

Its Chevron (or arrow) ^[1]is the image.In Wikipedia, is displayed as a background image by the background-image property and is in SVG format..

Wikipedia uses a MediaWiki specific, but most use a library of icon fonts.The most famous ones are FontAwesome and GitHub Octicons.There are many more, and here are some of the links below.

• Icons Bootstrap
• Ten convenient icon fonts for free commercial use
• Which web icon font should I use
• [2019 Edition] Recommended Web Icon Font and Usage Summary

The type of icon, usage conditions, usage, and browser support vary depending on the font.Please read each official website carefully before using it.

In most cases, all you have to do is leave the files, load the CSS, and attach the specified class to the specified tag.I omit the detailed structure, but I often use webfont when I use an old browser.Others include SVGs in the CSS, JavaScript replaces SVGs, and more advanced ones are rendered to SVGs when they are combined with JS frameworks such as React and Vue.js.Not only the front end, but also the server side said they would replace it with SVG.You have to be familiar with JavaScript and SVG in addition to CSS to understand these technologies.First of all, if you're just using it, it's safe to use it in the way it's written in each library.