This time I will show you how to use the new features of HTML 5. What are the precautions for using the new features of HTML 5? Here are practical cases, let’s take a look.
Preface
As we all know, HTML5 belongs to the World Wide Web Consortium (W3C). This organization provides standards for the entire Internet community, and the protocols formed in this way can be used around the world. In November 2016, the W3C updated the long-standing HTML 5 standard, its first minor update in 2 years. Many of the features originally proposed for HTML 5.1 were removed due to design flaws and lack of support from browser vendors.
Although there are some elements and feature improvements that have been brought into HTML 5.1, it is still a small update. Some of the new elements include combination tags, which now include
The W3C has also started working on the HTML 5.2 draft, which is expected to be released by the end of 2017. What we are here to present are the new features and improvements introduced in version 5.1. You don't need to touch javascript to take advantage of these features. Not all browsers support these features, so it's a good idea to check browser support before using them in production.
Prevent phishing attacks
Most people who use target ='_ blank' don't know an interesting fact - newly opened tabs can be changedwindow.opener.location to some phishing page. It will execute some malicious JavaScript code on your behalf on the open page. Because users trust that the page they open is safe, they have no doubts.
To completely eliminate this problem, HTML 5.1 has standardized the usage of the rel="noopener" attribute by isolating the browser context. rel="noopener" can be used in and tags.
<a href="#" target="_blank" rel="noopener">
The link won't make trouble anymore
</a>
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Flexible processing of picture titles
tag represents the title or legend associated with the element, usually as a container for visual elements such as pictures, charts, illustrations, etc. In earlier versions of HTML, could only be used as a child tag of the first or last . HTML5.1 has relaxed this restriction so that you can now use anywhere within a container.
<article>
<h1>The Headline of todays news </h1>
<figure>
<img src="petrolimage.jpeg" alt="Petrol price drops">
<figcaption>A man fueling up his car at petrol station</figcaption>
</figure>
<p>This is the forth hike in petrol prices in two month and the third in case of diesel in one fortnight.</p>
</article>
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spellcheck is an enumeration property whose values can be empty string, true and false. Specifying its status as true means that the element will be checked for spelling and grammar.
element.forceSpellCheck() will force user agents to report checked spelling and grammar errors on text elements, even if the user never focused input on that element.
The new version of HTML allows you to create an empty
The allowfullscreen attribute, a Boolean variable developed for Frame, allows you to control whether content can be displayed in full screen by using the requestFullscreen() method. For example, let's use an iframe embedded in a YouTube player. The allowfullscreen attribute needs to be set to allow the player to display the video in full screen.
<article>
<header>
<p><img src="/usericons/16235"> <b>Fred Flintstone</b></p>
<p><a href="/posts/30934" rel=bookmark>12:44</a> — <a href="#acl-503439551">Private Post</a></p>
</header>
<main>
<p>Check out my new video!</p>
<iframe title="Video" src="https://youtube.com/?id=92469812" allowfullscreen></iframe>
</main>
</article>
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HTML5.1 allows you to embed header and footer inside another header. You can add a header or footer to the header element if they contain themselves within paragraph content. This feature becomes useful if you want to add elaboration tags such as and to semantic paragraph elements.
In the following code, the tag contains a tag, which has an
<article>
<header>
<h2>Lesson: How to cook chicken</h2>
<aside>
<header>
<h2>About the author: Tom Hank</h2>
<p><a href="./tomhank/">Contact him!</a></p>
</header>
<p>Expert in nothing but Cooking. The cookbook sideshow.</p>
</aside>
</header>
<p><ins>Pour the marinade into the zip-top bag with the chicken and seal it.
Remove as much air as possible from the bag and seal it. </ins></p>
</article>
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I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!
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