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I have encountered some problems while learning HTML on the w3c website. Please help me solve them. _html/css_WEB-ITnose

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Release： 2016-06-24 12:09:54
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<a href="http://www.w3school.com.cn">W3School</a>href是哪个字的缩写？<td align="left">
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Which English word does td stand for?
Attribute values ​​should always be enclosed in quotes. Double quotes are the most commonly used, but there is no problem using single quotes. In some rare cases, such as when the attribute value itself contains double quotes, you must use single quotes. ??A passage in the w3c tutorial, then do you have to use double quotes when there are single quotes? What if there are both single and double quotes? 
<html><body><code>Computer code</code><br><kbd>Keyboard input</kbd><br><tt>Teletype text</tt><br><samp>Sample text</samp><br><var>Computer variable</var><br><p><b>注释：</b>这些标签常用于显示计算机/编程代码。</p></body></html>
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Examples in w3c tutorials, but still can’t understand what these computer codes are used for? 

<bdo dir="rtl">Here is some Hebrew text</bdo>
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What does bdo mean here?


This is the email link:
Send Email


What does subject=Hello again mean?


Here is another mailto link:
Send email!




Note: should be used to replace spaces between words so that the browser The text will be displayed correctly.


Can’t understand


Reply to discussion (solution)

It doesn’t make much sense to study this. Just know how to use it

1. href should be the abbreviation of Hyperlink Reference.
2. td should be the abbreviation of table data.
3. If the attribute value itself has quotation marks, it must be wrapped in different quotation marks outside. For example,

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