- You need the html declaration for web programming, because declaration helps browser how to react with tag means syntax of tags. Use only <!DOCTYPE HTML> for HTML5.
- The character encoding declaration is required. <meta charset="UTF-8">
- Tags note
- <head> tag contains only metadata.
- h1 is most important than h6.
- For Preformatted text <pre> tag accepts space and line break.
- <picture> is act like media query (responsive) tag. Can display different images in different media type from different sources.
- Can add new element in HTML5 with css and javaScript support.
- Attribute note
- Image size information provides by width and height attributes.
- Attribute title act like tooltips.
- For screen reader use alt attribute.
- Property note
- For image size use 'max-width:100%; height:auto;' property as 100%. Never exceed the image original size.
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