What is the difference between <section> and <div>?
What is the difference between <section> and <div> in HTML? Aren't we defining sections in both cases?
<section> means that the content inside is grouped (ie relates to a single theme), and should appear as an entry in an outline of the page.
<div> , on the other hand, does not convey any meaning, aside from any found in its class , lang and title attributes.
So no: using a <div> does not define a section in HTML.
From the spec:
<section>
The <section> element represents a generic section of a document or application. A section, in this context, is a thematic grouping of content. Each section should be identified, typically by including a heading (h1-h6 element) as a child of the <section> element.
Examples of sections would be chapters, the various tabbed pages in a tabbed dialog box, or the numbered sections of a thesis. A Web site's home page could be split into sections for an introduction, news items, and contact information.
...
The <section> element is not a generic container element. When an element is needed only for styling purposes or as a convenience for scripting, authors are encouraged to use the <div> element instead. A general rule is that the <section> element is appropriate only if the element's contents would be listed explicitly in the document's outline.
(https://www.w3.org/TR/html/sections.html#the-section-element)
<div>
The <div> element has no special meaning at all. It represents its children. It can be used with the class , lang , and title attributes to mark up semantics common to a group of consecutive elements.
Note: Authors are strongly encouraged to view the <div> element as an element of last resort, for when no other element is suitable. Use of more appropriate elements instead of the <div> element leads to better accessibility for readers and easier maintainability for authors.
(https://www.w3.org/TR/html/grouping-content.html#the-div-element)
<section>标记一段， <div>标记没有关联语义的通用块。
<div> Vs <Section>
Round 1
<div>: The HTML element (or HTML Document Division Element) is the generic container for flow content, which does not inherently represent anything. It can be used to group elements for styling purposes (using the class or id attributes), or because they share attribute values, such as lang. It should be used only when no other semantic element (such as <article> or <nav> ) is appropriate.
<section>: The HTML Section element ( <section> ) represents a generic section of a document, ie, a thematic grouping of content, typically with a heading.
Round 2
<div>: Browser Support 
<section>: Browser Support
The numbers in the table specifies the first browser version that fully supports the element. 
In that vein, a div is relevant only from a pure CSS or DOM perspective, whereas a section is relevant also for semantics and, in a near future, for indexing by search engines.
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