Integrating CSS and JavaScript effectively with HTML5 structure.

Use the ::selection pseudo-element of CSS to customize the highlighting style when the web page text is selected to improve the aesthetics and unity of the page. 1. Basic settings: define background-color and color through ::selection, such as yellow background with dark gray fonts; specific elements such as p::selection can also be limited. 2. Compatibility processing: Add the -webkit- prefix to be compatible with Safari and mobile browsers, and the Firefox and Edge standards are well supported. 3. Pay attention to readability: Avoid excessive color contrast or too fancy, and should be coordinated with the overall design. For example, choose a soft blue base in dark mode to improve visual comfort. Reasonable use can enhance the texture of the interface, ignore details

Word-break and overflow-wrap (formerly word-wrap) do differently when dealing with long words or unbreakable content. 1. Word-break controls how to break lines of words in block elements, break-all forces long words to break, keep-all avoids breaking, suitable for Chinese, Japanese and Korean texts. 2. Overflow-wrap disconnects long words when necessary to prevent overflow, break-word makes the context more intelligent. 3. In usage scenarios, use word-break:break-all for code, and use overflow-wrap:break-word for user comments. 4. Pay attention to differences in browser compatibility and different mobile behaviors

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.

The white-space attribute is used in CSS to control the processing of blank spaces in elements, mainly affecting the display behavior of spaces, tabs and newlines. Common values include: 1.normal (default value, blank collapses into one space, automatic line break); 2.pre (keep all blanks, only line breaks at newlines); 3.nowrap (fold blank but not line breaks); 4.pre-wrap (keep blank, line breaks allow); 5.pre-line (fold blank, line breaks in the source code). When you need to keep the code indent or chat record format, it is recommended to use pre-wrap; for long words or URLs that cause layout overflow, you can combine word-break or overflo

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.

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 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.

The border-image attribute creates borders through images to improve design flexibility. It includes source, slice, width, outset and repeat sub-attributes, and syntax is such as border-image:url(border.png)30round; when using it, you need to pay attention to setting the source and slice values usually do not have units, compatibility, and priority relationship with border-width; it is common in scenarios such as cards, buttons, and background image modification. For example, by .box{border:10pxsolidtransparent;border-image-source:url(frame.png)