| Article Introduction: XHTML tag elements can be divided into: replacement elements and irreplaceable elements. |
xhtml tag elements can be divided into: substitution elements and irreplaceable elements
A substitution element refers to the element that controls the display of content by combining label and label attributes.
For Example: Label must be together with SRC attribute to define picture display;
table cell element label must be matched with type selection types;
non-replacement elements refer to: elements that directly display the content of the Web page (most of the page elements belong to this category)
XHTML tag elements can also be divided into: block-level elements and inline elements
block-level elements: content does not wrap (you can set width and height)
Inline
elements: Content Wrapping (no width and height can be set) * Replace elements except inline elements (you can set width and height)
the applicability of CSS properties is to determine which properties are available and which properties are unavailable through the different elements .
CSS Property Applicability Rollup:
1) only use block elements apply: text-align;text-indent;clear;
2 Only the positioning element is applicable: Top/right/bottom/left;z-index;
3) Only the list element is applicable (Display:iist-item): list-style-type;list-style-image;list-style-position;
4 only: Before and: After application: content;
5 only inline elements and table cells Apply: Vartical-align;
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Applicability of individual properties:
1) Applicability of Width/height/min-width/min-height/max-width/max-width:
all elements, in addition to the inline elements of a replacement element, table rows and table row groups
2) margin/padding applicability:
all elements except table rows; table row group; table column; table column Group; table header Group; table Footer Group;
3) Overflow applicability:
block-level elements and substitution elements
4) Clip applicability:
Absolute positioning elements only (including absolute and fixed positioning)
Only a continuous summary can be more in-depth understanding of knowledge and find their own shortcomings.
