在現代網頁設計中，視頻已經成為了必不可少的元素。而HTML5提供了更多的視頻特效代碼，可以使我們更加輕松地實現各種效果，讓網頁看起來更加生動、有趣。 下面我們來看一些HTML5網頁視頻特效代碼示例：

1. 視頻播放器

<video id="myVideo" width="320" height="240">
<source src="video.mp4" type="video/mp4">
<source src="video.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>

2. 視頻控制條

<video id="myVideo" width="320" height="240">
<source src="video.mp4" type="video/mp4">
<source src="video.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
<script>
var video = document.getElementById("myVideo");
var playBtn = document.getElementById("playBtn");
var pauseBtn = document.getElementById("pauseBtn");
var fullBtn = document.getElementById("fullBtn");
var progressBar = document.getElementById("progressBar");
playBtn.addEventListener("click", function() {
video.play();
});
pauseBtn.addEventListener("click", function() {
video.pause();
});
fullBtn.addEventListener("click", function() {
video.requestFullscreen();
});
video.addEventListener("timeupdate", function() {
progressBar.value = video.currentTime / video.duration * 100;
});
progressBar.addEventListener("mousedown", function(event) {
var x = event.pageX - this.offsetLeft;
var percent = x / this.offsetWidth;
video.currentTime = video.duration * percent;
});
</script>

3. 視頻背景

<div id="videoBg">
<video autoplay loop muted>
<source src="video.mp4" type="video/mp4">
<source src="video.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
<h1>Hello, World!</h1>
</div>
<style>
#videoBg {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: -1;
}
#videoBg video {
width: 100%;
height: 100%;
object-fit: cover;
}
</style>

總結：

通過使用HTML5提供的視頻特效代碼，我們可以很容易地實現各種效果，如視頻播放器、視頻控制條和視頻背景等。這些特效可以幫助我們讓網頁更加生動、有趣，增強用戶體驗。希望本文對你有所幫助，謝謝。