HTML tag

First, check whether the src attribute path is correct, and ensure that the relative or absolute path matches the HTML file location; 2. Verify whether the file name and extension are spelled correctly and case-sensitive; 3. Confirm that the image file actually exists in the specified directory; 4. Use appropriate alt attributes and ensure that the image format is .jpg, .png, .gif or .webp widely supported by the browser; 5. Troubleshoot browser cache issues, try to force refresh or directly access the image URL; 6. Check server permission settings to ensure that the file can be read and not blocked; 7. Verify that the img tag syntax is correct, including the correct quotes and attribute order, and finally troubleshoot 404 errors or syntax problems through the browser developer tool to ensure that the image is displayed normally.

Thetagisusedtomarkdeletedtext,optionallywithdatetimeandciteattributestospecifywhenandwhythedeletionoccurred.2.Thetagindicatesinsertedcontent,alsosupportingdatetimeandciteforcontextabouttheaddition.3.Thesetagscanbecombinedtoshowdocumentrevisionsclearl

Yes, you can make HTML elements editable by using the contenteditable attribute. The specific method is to add contenteditable="true" to the target element. For example, you can edit this text, and the user can directly click and modify the content. This attribute is suitable for block-level and in-line elements such as div, p, span, h1 to h6. The default value is "true" to be editable, "false" to be non-editable, and "inherit" to inherit the parent element settings. In order to improve accessibility, it is recommended to add tabindex="0&quo

Thebdotagisusedtooverridethebrowser’sdefaulttextdirectionrenderingwhendealingwithmixedleft-to-rightandright-to-lefttext,ensuringcorrectvisualdisplaybyforcingaspecificdirectionusingthedirattributewithvalues"ltr"or"rtl",asdemonstrat

TheasyncattributeinHTMLisusedtoloadandexecuteexternalJavaScriptfilesasynchronously,allowingthebrowsertodownloadthescriptinparallelwithHTMLparsingandexecuteitimmediatelyuponcompletion,whichimprovespageloadperformancebypreventingrender-blocking;itisbes

To set the default value for HTMLselect elements, the corresponding option element must be marked with the selected attribute; 1. Add the selected attribute to the option you want to select by default, such as UnitedStates; 2. Ensure that only one option in a single select has selected attribute, and if there are multiple ones, the first one will be the source code order; 3. The selected attribute can be placed anywhere in the list, not limited to the first option; 4. This method is suitable for single-select and multiple-select select; 5. If you need to set it dynamically, you can use JavaScript to operate the value attribute, such as document.querySelec

Thetagisusedtodefinecontactinformationfortheauthororownerofadocumentorsection;1.Useitforemail,physicaladdress,phonenumber,orwebsiteURLwithinanarticleorbody;2.Placeitinsideforauthorcontactorinfordocument-widecontact;3.StyleitwithCSSasneeded,notingdefa

Tocenteradivhorizontally,usemargin:0autowithadefinedwidth.2.Forhorizontalandverticalcentering,applydisplay:flexontheparentwithjustify-content:centerandalign-items:center.3.Alternatively,useCSSGridwithplace-items:centerforbothdirections.4.Asafallback,