HTML block element Inline element

Block element

Address-Addresses
BLOCKQUOTE-Block Reference
Center-lifting Alignment block
DIR-List of directories
Div-Common block-level easy, is also the main tag of CSS layout
DL-Definition List
Fieldset-form control Group
Form-Interactive Form
H1-Big title
H2-Subtitle
H3-3 level headings
H4-4 level headings
H5-5 level headings
H6-6 level headings
HR-Horizontal Divider Line
Isindex-input prompt
menu-List of menus
Noframes-frames Optional content (this chunk content is displayed for browsers that do not support frame
NoScript-Optional script content (this content is displayed for browsers that do not support script)
OL-Ordered form
P-Paragraph
Pre-formatted text
Table-Tables
UL-unordered list

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Inline elements

A-anchor point
ABBR-Abbreviation
Acronym-the first word
B-Bold (not recommended)
Bdo-bidi Override
Big-Large font
BR-line break
Cite-citation
Code-Computer codes (required when referencing source)
DFN-Defining fields
EM-emphasize
Font-typeface settings (not recommended)
I-Italic
IMG-Images
Input-Enter box
KBD-Define keyboard text
Label-Table Label
Q-Short Reference
S-Medium dash (not recommended)
Samp-Define sample computer code
Select-Project Selection
Small-Small font text
Span-a common inline container that defines chunks within a text
Strike-Medium Dash
Strong-Bold Emphasis
Sub-subscript
SUP-Superscript
TEXTAREA-Multi-line text input box
TT-Telex text
U-Underline
var-Defining variables

1, HTML line within the element (a) can not put block elements (DIV)
Answer: No.
The XHTML standard is defined like this:
*inline
      *a
         *inline excluding an enclosed a element
The explanation is that the a tag is inline, the a tag can only nest inline elements, and can no longer nest a tag.

2, that span inside can put DIV??
Answer: No
1, HTML line within the element (a) can not put block elements (DIV)
Answer: No.