The difference between similar tags and attributes in html

【1】 and tags

Same: both represent italics.

Difference: (1) represents the emphasized content, is physically italicized and has no content meaning.

(2) tags are tags that "contain semantics" , and search engines will understand these semantics. It is specially set to mean "emphasis" in HTML. When discovering these "emphasis" tags, some screen readers may use a different inflection, which is more beneficial to SEO.

【2】
and

tags

are the same: both have the newline attribute.

Difference:
used alone; performs small line breaks.

　　

Use in pairs; perform large line breaks between paragraphs.

【3】 and tags

is a logical tag that strengthens the tone of the character and expresses emphasis. The specific performance of strong can also be changed through css.

is the entity tag, which means bold.

In order to comply with the current W3C standards, it is recommended to use the strong tag.

【4】 and

tags

is the same: container tag is widely used in html language. If you replace "

" with "", will be executed The effect was found to be exactly the same. Both of them function to separate each block independently.

Difference: is that line elements will not wrap before and after it;

And

is a block-level element, and the elements it surrounds will automatically wrap. One div occupies one line.

【5】valign and align attributes

valign: Represents the verticalalignment of the row [top middle/middle bottom]

align: Represents the alignment in the horizontal direction [left center/middle right]

【6】center and middle attributes

align=middle Usually the picture is centered

align=center Usually text centered

Can be used if the effect is the same

Usually using center, middle may not work in IE

【7】 and

provides more powerful functions and richer content.

Everything between the

and the tags is the content of the button, which includes any acceptable body content, such as text or multimedia content.

The only prohibited element is image mapping.

Always specify the type attribute for buttons.

The default type in

Internet Explorer is "button", while the default in other browsers (including the W3C specification) is "submit".

【8】text-align:center and

not only affects the text, but also centers the entire element.

text-align does not control the alignment of elements, but only affects the internal content.

The element itself does not move from one end to the other, only the text within it is affected.

【9】letter-spacing and word-spacing

letter-spacing refers to the spacing between letters;

word-spacing refers to words spacing.

Chinese is generally letter-spacingControl character spacing

word-spacing does not work for Chinese

Part of the information comes from (http://blog.sina.com.cn/s/blog_52dbd87601013vmp.html) Infringement deleted

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