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Html grammar study notes 2_html/css_WEB-ITnose

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Jun 24, 2016 am 11:41 AM

1. Image tag (<img src="/static/imghwm/default1.png" data-src="url" class="lazy" alt="Html grammar study notes 2_html/css_WEB-ITnose" >) and source attribute (Src)

In HTML, images are defined by the <img src="/static/imghwm/default1.png" data-src="url" class="lazy" alt="Html grammar study notes 2_html/css_WEB-ITnose" > tag.
<img src="/static/imghwm/default1.png" data-src="url" class="lazy" alt="Html grammar study notes 2_html/css_WEB-ITnose" > is an empty tag, which means that it only contains attributes and has no closing tag.
To display an image on the page, you need to use the source attribute (src). src refers to "source". The value of the source attribute is the URL address of the image.
The syntax for defining an image is:

<img  src="/static/imghwm/default1.png" data-src="url" class="lazy" alt="Html grammar study notes 2_html/css_WEB-ITnose" >

The URL refers to the location where the image is stored. If an image named "boat.gif" is located in the images directory of www.w3school.com.cn, its URL is http://www.w3school.com.cn/images/boat.gif.
The browser displays the image in the document where the image tag appears. If you place an image tag between two paragraphs, the browser will display the first paragraph first, then the image, and finally the second paragraph.
Replacement text attribute (Alt)
The alt attribute is used to define a string of prepared replaceable text for the image. The value of the replacement text attribute is user-defined.

<img src="/static/imghwm/default1.png" data-src="boat.gif" class="lazy" alt="BigBoat">

When the browser cannot load the image, the replacement text attribute tells readers the information they lost. At this point, the browser will display this alternative text instead of the image. It's a good practice to add the alt text attribute to all images on the page. This helps display information better and is very useful for those who use text-only browsers.
Basic Notes - Helpful Tips:
If an HTML file contains ten images, then in order to display the page correctly, 11 files need to be loaded. Loading images takes time, so our advice is: use images with caution.

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