Image not displayed is usually caused by a wrong file path, incorrect file name or extension, HTML syntax issues, or browser cache. 1. Make sure that the src path is consistent with the actual location of the file and use the correct relative path; 2. Check whether the file name case and extension match exactly, and verify whether the image can be loaded by directly entering the URL; 3. Check whether the img tag syntax is correct, ensure that there are no redundant characters and the alt attribute value is appropriate; 4. Try to force refresh the page, clear the cache, or use incognito mode to eliminate cache interference. Troubleshooting in this order can solve most HTML image display problems.

?Youcannotnesttagsinsideanothertagbecauseit’sinvalidHTML;browsersautomaticallyclosethefirstbeforeopeningthenext,resultinginseparateparagraphs.?Instead,useinlineelementslike,,orforstylingwithinaparagraph,orblockcontainerslikeortogroupmultipleparagraph

To create an HTML unordered list, you need to use a tag to define a list container. Each list item is wrapped with a tag, and the browser will automatically add bullets; 1. Create a list with a tag; 2. Each list item is defined with a tag; 3. The browser automatically generates default dot symbols; 4. Sublists can be implemented through nesting; 5. Use the list-style-type attribute of CSS to modify the symbol style, such as disc, circle, square, or none; use these tags correctly to generate a standard unordered list.

ThecontenteditableattributemakesanyHTMLelementeditablebyaddingcontenteditable="true",allowinguserstodirectlymodifycontentinthebrowser.2.Itiscommonlyusedinrichtexteditors,note-takingapps,andin-placeeditinginterfaces,supportingelementslikediv

SemanticHTMLimprovesbothSEOandaccessibilitybyusingmeaningfultagsthatconveycontentstructure.1)ItenhancesSEOthroughbettercontenthierarchywithproperheadinglevels,improvedindexingviaelementslikeand,andsupportforrichsnippetsusingstructureddata.2)Itboostsa

The Schema.org tag helps search engines understand the structured data format of web page content through semantic tags (such as item scope, item type, itemprop); it can be used to define custom vocabulary, methods include extending existing types or using additionalType to introduce new types; in actual applications, keeping the structure clear, using official attributes first, testing code validity, and ensuring that custom types are accessible; precautions include accepting partial support, avoiding spelling errors, and choosing a suitable format such as JSON-LD.

Usetheelementwithinatagtocreateasemanticsearchfield.2.Includeaforaccessibility,settheform'sactionandmethod="get"attributestosenddatatoasearchendpointwithashareableURL.3.Addname="q"todefinethequeryparameter,useplaceholdertoguideuse

Use the onclick attribute in HTML to directly bind click events, which is suitable for simple scenarios but is not conducive to code maintenance; 2. The onclick attribute assignment function of elements in JavaScript is more conducive to separating structures and behaviors, but will overwrite the previous event handler; 3. It is recommended to use the addEventListener method to support multiple event monitoring and better control the event flow, and should operate after the DOM is loaded to avoid common errors such as premature access to elements or quotation conflicts in HTML. Therefore, onclick is suitable for beginners and small projects, while addEventListener is more suitable for complex applications.