Core knowledge points of HTML

1. Basic Concepts of HTML

• Definition and Purpose of HTML
• Basic Structure of an HTML Document
• Differences Between Tags, Elements, and Attributes
• HTML Document Type Declaration
• Syntax and Purpose of Comments
• Handling Rules for Whitespace and Line Breaks
• Representation Methods for Special Characters
• Encoding Settings for HTML Documents

2. Text Formatting Tags

• Heading Tags (h1-h6)
• Paragraph Tag (p)
• Line Break Tag (br)
• Horizontal Rule Tag (hr)
• Text Emphasis Tags (strong, em)
• Subscript and Superscript Tags (sub, sup)
• Preformatted Text Tag (pre)
• Quotation Tags (blockquote, q)
• Address Tag (address)
• Abbreviation Tag (abbr)
• Code Display Tag (code)
• Keyboard Input Tag (kbd)
• Variable Tag (var)

3. Hyperlinks and Anchors

• Basic Syntax of Hyperlinks (a)
• Linking to External Web Pages
• Linking to Local Files
• Linking to Email (mailto)
• Linking to File Downloads
• Creation and Use of Page Anchors
• Target Attribute of Links
• Title Attribute of Links
• Styling Control for Link States
• Usage of Image Maps

4. Images and Multimedia

• Basic Usage of the Image Tag (img)
• Alternative Text for Images (alt Attribute)
• Setting Image Width and Height
• Image Alignment Methods
• Setting Image Borders
• Application of Image Maps
• Usage of Background Images
• Methods for Embedding Audio
• Methods for Embedding Video
• Methods for Embedding Flash

5. Table-Related Tags

• Basic Structure of Tables (table, tr, td)
• Setting Table Borders
• Table Width and Height
• Cell Spacing and Padding
• Table Caption (caption)
• Header Cells (th)
• Merging Cells (rowspan, colspan)
• Table Grouping (thead, tbody, tfoot)
• Column Grouping (colgroup, col)
• Nested Tables

6. Forms and Input Controls

• Basic Structure of Forms (form)
• Form Submission Methods (method)
• Target Window for Forms (target)
• Text Input Field (input type="text")
• Password Input Field (input type="password")
• Radio Buttons (input type="radio")
• Checkboxes (input type="checkbox")
• Submit Button (input type="submit")
• Reset Button (input type="reset")
• Generic Button (input type="button")
• File Upload (input type="file")
• Hidden Field (input type="hidden")
• Multi-line Text Area (textarea)
• Dropdown Select Box (select, option)
• Form Fieldset (fieldset, legend)

7. List-Related Tags

• Unordered List (ul, li)
• Ordered List (ol, li)
• Styling Control for List Items
• Definition List (dl, dt, dd)
• Nested Lists
• Directory and Menu Lists (Deprecated)
• Application of Lists in Navigation

8. Frames and Windows

• Basic Concept of Framesets (frameset)
• Frame Division Methods (rows, cols)
• Definition of Individual Frames (frame)
• Name Attribute of Frames
• Scrollbar Control for Frames
• Border Control for Frames
• Nested Frames
• Inline Frame (iframe)
• Communication Between Frames
• Pros and Cons of Frames

9. Metadata and Head Content

• Purpose of the head Tag
• Importance of the title Tag
• Common Uses of the meta Tag
• Keywords and Description Information
• Page Refresh and Redirect
• Setting the Base URL (base)
• Linking External Resources (link)
• Including Style Sheets
• Including Scripts (script)
• Character Set Declaration

10. HTML Document Structure and Semantics

• Difference Between div and span
• Usage of id and class Attributes
• Significance of Semantic Markup
• Organization of Content Sections
• Control of Text Direction
• Setting Language Attributes
• Concept of Document Outline
• Accessibility Considerations
• Browser Compatibility Issues
• Methods for Validating HTML Documents