User agent stylesheets are the default CSS styles that browsers automatically apply to ensure that HTML elements that have not added custom styles are still basic readable. They affect the initial appearance of the page, but there are differences between browsers, which may lead to inconsistent display. Developers often solve this problem by resetting or standardizing styles. Use the Developer Tools' Compute or Style panel to view the default styles. Common coverage operations include clearing inner and outer margins, modifying link underscores, adjusting title sizes and unifying button styles. Understanding user agent styles can help improve cross-browser consistency and enable precise layout control.

Backdrop-filter is used to apply visual effects to the content behind the elements. 1. Use backdrop-filter:blur(10px) and other syntax to achieve the frosted glass effect; 2. Supports multiple filter functions such as blur, brightness, contrast, etc. and can be superimposed; 3. It is often used in glass card design, and it is necessary to ensure that the elements overlap with the background; 4. Modern browsers have good support, and @supports can be used to provide downgrade solutions; 5. Avoid excessive blur values and frequent redrawing to optimize performance. This attribute only takes effect when there is content behind the elements.

shutil.rmtree() is a function in Python that recursively deletes the entire directory tree. It can delete specified folders and all contents. 1. Basic usage: Use shutil.rmtree(path) to delete the directory, and you need to handle FileNotFoundError, PermissionError and other exceptions. 2. Practical application: You can clear folders containing subdirectories and files in one click, such as temporary data or cached directories. 3. Notes: The deletion operation is not restored; FileNotFoundError is thrown when the path does not exist; it may fail due to permissions or file occupation. 4. Optional parameters: Errors can be ignored by ignore_errors=True

Define@keyframesbouncewith0%,100%attranslateY(0)and50%attranslateY(-20px)tocreateabasicbounce.2.Applytheanimationtoanelementusinganimation:bounce0.6sease-in-outinfiniteforsmooth,continuousmotion.3.Forrealism,use@keyframesrealistic-bouncewithscale(1.1

TobuildaDockerimagewithoutusingthecache,passthe--no-cacheflagtothedockerbuildcommand;thisensuresalllayersarerebuiltfromscratch,avoidingoutdateddependenciesorstalelayers,whichisusefulfordebugging,ensuringfreshpackageinstallations,achievingreproducible

Use multiprocessing.Queue to safely pass data between multiple processes, suitable for scenarios of multiple producers and consumers; 2. Use multiprocessing.Pipe to achieve bidirectional high-speed communication between two processes, but only for two-point connections; 3. Use Value and Array to store simple data types in shared memory, and need to be used with Lock to avoid competition conditions; 4. Use Manager to share complex data structures such as lists and dictionaries, which are highly flexible but have low performance, and are suitable for scenarios with complex shared states; appropriate methods should be selected based on data size, performance requirements and complexity. Queue and Manager are most suitable for beginners.

DanglingimagesareuntaggedlayersnotassociatedwithanycontainerandcanberemovedusingDocker’sbuilt-incommands.1.Usedockerimageprunetosafelyremovedanglingimagesafterconfirmation,oradd-ftoforceremovalwithoutprompt.2.Usedockerimageprune-atoalsoremoveallunuse

CriticalCSSistheminimalCSSneededtostyleabove-the-foldcontent,enablingfasterinitialpagerenderingbyreducingrender-blockingresources;itworksbyinliningessentialstylesintheoftheHTMLanddeferringtherest.1.Identifyabove-the-foldstylesrequiredforinitialviewpo