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This article mainly introduces what is the basic grammar of HTML. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

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Tags are placed in angle brackets, appear in pairs, and are closed (start-end tag, self-closing tag)

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Tags can be written with one or more attributes: attribute name = "attribute value" multiple attributes are separated by spaces

Tags can be nested and closed in nesting order

/ / when the browser encounters a comment, it automatically ignores the comment content

Explanation: when the HTML structure of the page is complex or has a lot of content, you need to add the necessary comments to facilitate code reading and maintenance.

Debugging: temporarily comment out some unnecessary HTML code to preview the effect

Writing specification: lowercase, attribute values in double quotes, nested indentation (clear code, easy to maintain)

Common attributes (global attributes): attributes that are valid for all tags

Id attribute: specifies the unique identity of the element in the page

Class attribute: specifies the class name of the element. Elements with uniform functions or styles on the page can be used.

Style attribute: specifies the style of the element. You can write the CSS style directly in the style attribute, but the structure and presentation are mixed, which is not conducive to maintenance.

Title attribute: specifies some additional information about the element, which will be displayed when you move the mouse over the element, such as displaying incomplete content or explaining the meaning of the chart.

/ / the difference between id and class: the same class can appear multiple times on the page, while id can only appear once.

Row-level elements & block-level elements

Row-level elements: (default width) content width, (can width and height be set) No, (start position) peer display

Block-level element: (default width) parent element width, (can width and height be set), (starting position) line wrap, that is, exclusive line

/ / for more information, CSS-display sets the display mode of elements.

Block (block level element) div,p,h2~h7,ul,form...

Inline (row-level element) span,a,label,cite,em...

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