Browser default styles ensure basic readability by automatically applying margins, fills, fonts, and form element styles, but can cause inconsistent cross-browser layouts. 1. The default margin and fill change the layout flow, such as the spacing of titles, paragraphs and lists; 2. The default font settings affect readability, such as 16px font size and TimesNewRoman font; 3. The form elements are very different in different browsers, so the appearance needs to be reset; 4. Some tags such as strong and em have default emphasis styles and need to be explicitly overwritten. Workarounds include using Normalize.css, reset styles, or globally clear margins and fills, while customizing fonts and form styles for consistency.

To beautify the beginning of a paragraph to enhance visual appeal, a common practice is to use pseudo-elements of CSS or manually style the document. In web development, p::first-letter can be used to set the first letter style, such as enlarging, bolding, and discoloring, but it should be noted that it is only suitable for block-level elements; if you want to highlight the entire first line, use p::first-line to add styles; in document software such as Word, you can manually adjust the first letter format or create style templates, and InDesign has a built-in "first-sinking" function suitable for publishing and design; when applying, you need to pay attention to details, such as avoiding complex styles affecting reading and ensuring compatibility and format consistency.

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The tab-size attribute is used to control the number of spaces displayed by tab characters in HTML. The default is 8. The common usage is to adjust the indentation of the code block. 1. Basic usage: Set pre{tab-size:4;} to make the tab appear as 4 space widths, supporting numbers or inherit values. 2. Usage scenario: When displaying code in the structure, adjust the tab indent to make the layout more compact and beautiful, such as setting precode{tab-size:2;}. 3. Notes: Mainstream browsers support but IE is incompatible; it only affects tab display and does not affect spaces; child elements need to be set separately, otherwise the parent settings will not be inherited. The rational use of this attribute can improve the text display effect, especially for code document typesetting.

CSS' counter-reset and counter-increment are used to automatically number HTML elements. 1. Use counter-reset to initialize or reset the counter, for example, section{counter-reset:sub-section;} to create a counter named sub-section; 2. Increment the counter through counter-increment, such as h3{counter-increment:sub-section;} to increment each h3 title number; 3. Use content attribute to combine pseudo-elements to display the counter, such as h3::before{content:

The CSS rule set consists of selectors and declaration blocks to define the style of HTML elements. 1. The selector specifies the target element, such as a tag, class, or ID; 2. Declare the block to contain attributes and values to control the appearance of the element. For example: p{color:blue;font-size:16px;} means selecting the paragraph and setting the text color and font size. Master these two parts to write effective CSS styles.

There are five ways to locate CSS: static, relative, absolute, fixed and sticky. static is the default positioning, following the document flow and does not support offset; relative moves relative to its original position and is still in the document flow; absolute is separated from the document flow, and is positioned relative to the nearest non-static positioning and ancestor positioning; fixed relative to the browser window, and is often used to fix the navigation bar; sticky is between relative and fixed, scrolling to a specific position and fixed, suitable for sticky heads. Mastering their behavioral differences is key to layout.

Automatic prefixes using Autoprefixer are the most recommended practices at present. It can automatically add necessary prefixes according to the target browser configuration, reduce redundant code and support mainstream construction tools; 2. Manual prefixes are suitable for debugging or experimental development. Common prefixes include -webkit-, -moz-, -ms-, -o-, but repeated codes are expensive to maintain, and are not recommended for long-term use; 3. Common attributes that require prefixes include Flexbox/Grid layout, animation transition, gradient background, filter transformation, user selection control, etc., which can be processed through CanIUse query compatibility or directly dependency tools.