【1】 is the same as tag
: both indicate italics.
Difference:
(1) indicates the content that is emphasized, is physically italicized and has no content meaning.
(2) The tag is a tag that "contains semantics", and search engines will understand these semantics. It is specifically 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: they both have line break attributes.
Difference:
used alone; performs small line breaks.
Use in pairs; perform large line breaks between paragraphs.
【3】 and tags
are logical tags that strengthen the tone of the characters and express emphasis. The specific performance of strong can also be changed through css.
is an entity tag, which means bold.
In order to comply with the current W3C standards, it is recommended to use the strong tag.
【4】 and are the same: container tags and are widely used in html language. If you replace " Difference: is a line element and will not wrap before and after it; and 【5】valign and align attributes valign: represents the vertical alignment of the row [top, center/mmiddle, bottom] align: represents the horizontal alignment Its [left center/middle right] [6] center and middle attributes align=middle usually centers the picture align=center usually centers the text Can be used when the effect is the same Usually use center, middle may not work in IE [7] 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 text-align does not control the alignment of elements, but only affects the internal content. The element itself will not move from one end to the other, only the text within it will be affected. 【9】letter-spacing and word-spacing letter-spacing refers to the spacing of letters; word-spacing refers to the spacing of words. Chinese generally uses letter-spacing to control character spacing Word-spacing does not work for Chinese For more detailed explanations of the differences between similar tags and attributes in HTML, please refer to related articles Follow PHP Chinese website! tags
" with "< span>", after execution, you will find that the effect is exactly the same. Both of them function to separate each block independently.
is a block-level element and the elements it surrounds will automatically wrap. One div occupies one line.
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source：php.cn
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