All HTML documents must start with a document type declaration: <!DOCTYPE html>.
The HTML document itself begins with <html> and ends with </html>.
The visible part of the HTML document is between <body> and </body>.
HTML headings are defined with the <h1> to <h6> tags.
<h1> defines the most important heading. <h6> defines the least important heading:
HTML paragraphs are defined with the <p> tag:
HTML links are defined with the <a> tag:
HTML images are defined with the <img> tag.
The source file (src), alternative text (alt),
width, and height are provided as attributes:
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