Five tags that are not part of PHP and an introduction to their functions

Introduction to five tags that do not belong to PHP and their functions

In web development, we often use HTML, CSS and JavaScript to build web pages. In addition to these common tags and languages, there are also tags that are not part of PHP and can add more functionality and style to web pages. Below, we'll introduce five such tags and provide specific code examples.

1. SVG (Scalable Vector Graphics)

SVG is an XML markup language used to describe vector graphics. It can be used to create various graphics such as lines, shapes and text without distortion. SVG allows developers to draw complex graphics on web pages and can be styled through CSS.

Sample code:

<svg width="100" height="100">
  <circle cx="50" cy="50" r="40" fill="red" />
</svg>

This code can draw a red circle on the web page.

2. Canvas

Canvas is a tag in HTML5 that allows developers to draw graphics on web pages through JavaScript. Canvas provides a set of APIs that can draw various shapes, text, and images, and these elements can be dynamically updated and manipulated through JavaScript.

Sample code:

<canvas id="myCanvas" width="200" height="100"></canvas>
<script>
  var canvas = document.getElementById("myCanvas");
  var ctx = canvas.getContext("2d");
  ctx.fillStyle = "blue";
  ctx.fillRect(10, 10, 50, 50);
</script>

This code can draw a blue rectangle on the web page.

3. WebGL

WebGL is a Web graphics library based on OpenGL, which can achieve high-performance 3D graphics rendering on web pages. With WebGL, developers can create a variety of complex 3D scenes, such as games, animations, and data visualizations.

Sample code:

<canvas id="myCanvas"></canvas>
<script>
  var canvas = document.getElementById("myCanvas");
  var gl = canvas.getContext("webgl");
  gl.clearColor(0.0, 0.0, 0.0, 1.0);
  gl.clear(gl.COLOR_BUFFER_BIT);
</script>

This code can use WebGL on a web page to clear the canvas and fill it with black.

4. WebRTC

WebRTC is a real-time communication technology that enables audio and video communication between different devices directly through the browser without resorting to plug-ins or third-party software. Developers can use the WebRTC API to build features such as video conferencing, real-time chat, and remote desktop.

Sample code:

Since WebRTC involves real-time audio and video streaming, the code is relatively complex. Here is a simple example of creating a local media stream:

navigator.mediaDevices.getUserMedia({ video: true, audio: true })
  .then(function(stream) {
    var video = document.querySelector("video");
    video.srcObject = stream;
  })
  .catch(function(error) {
    console.log("getUserMedia error: ", error);
  });

5. WebAssembly

WebAssembly is a new type of binary instruction set that can efficiently run programs written in other languages ​​​​such as C, C, Rust, etc. in the browser. WebAssembly can add more computing and processing power to web pages, making it possible to run faster applications in the browser.

Sample code:

Since programs written in WebAssembly are usually compiled and generated in other languages, here is a simple example that uses C language to write an addition function and displays it on the web page through WebAssembly Call:

// add.c
int add(int a, int b) {
  return a + b;
}

// index.html
<script type="text/javascript">
  fetch('add.wasm')
    .then(response => response.arrayBuffer())
    .then(bytes => WebAssembly.instantiate(bytes, {}))
    .then(results => {
      const instance = results.instance;
      console.log(instance.exports.add(2, 3));
    });
</script>

This code shows how to call a simple addition function through WebAssembly on a web page.

Summary:

The above introduces five tags and functions that do not belong to PHP, which can enrich the interactivity, dynamics and visual effects of web pages. Developers can choose appropriate tags and technologies based on their needs to exert more creativity and implement more complex functions in web development.

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