<a href="mailto:{email}?subject={subject}&body={content}">
Send us an email
</a>
<a href="tel:{phone}">
Call us
</a>
<a href="sms:{phone}?body={content}">
Send us a message
</a>
3. Ordered lists with the `start` attribute
Use the attribute startto change the starting point for your ordered lists.
4. The meter element
You can use the element <meter> to display quantities. No JavaScript / CSS required.
5. HTML Native Search
6. Fieldset element
You can use the element fieldsetto group multiple controls as well as labels ( label ) in a web form.
7. Window.opener
Pages opened with target = "_ blank"allow the new page to access the original’s window.opener. This can have safety and performance implications. Turn on rel = "noopener" or rel = "noreferrer"to prevent this from happening.
Use an image format .webpto reduce image size and improve the performance of your website.
<picture>
<!-- load .webp image if supported -->
<source srcset="logo.webp" type="image/webp">
<!--
Fallback if `.webp` images or <picture> tag
not supported by the browser.
-->
<img src="logo.png" alt="logo">
</picture>
16. Thumbnail for video
Use the attribute posterto specify the image to be displayed while the video is loading or until the user clicks the play button.