Inline flow | Limit the range of the double slider: prevent the minimum value from exceeding the maximum value | Vortex flow meter

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1. What is BFC? In depth understanding of BFC, lets talk about its function. BFC (Block Formatting Context) is an independent rendering area in CSS, where the layout of its internal elements is not affected by external factors and does not affect the external layout. It solves common layout problems by constraining the arrangement of internal boxes through specific rules. The triggering conditions for BFC are based on W3C specifications, and BFC will be created in the following situations: root element (such as), floating element (float is not none), absolute positioning element (position is absolute or fixed), intra row block element (display: inline block), table related element (such as display: table cell), block element whose overflow calculation value is not visible, direct child element of elastic or grid container (display: flex/inline flex or grid/inline grid), and display: flow row (a property specifically used to generate BFC). For example, a regular

defaults to the root elements BFC, but if overflow: hidden is set for it, a new BFC will be generated. The core function of BFC is to solve the vertical margin collapse. Within the same BFC, the vertical margins of adjacent block level elements will merge (taking the larger value). By wrapping one of the elements in a new BFC, overlap can be avoided. For example, if two adjacent

belong to the same root BFC, their margin top and margin bottom will overlap; If one of them is wrapped in an overflow: hidden container, it will no longer overlap because it belongs to a different BFC. Key point: Overlap only occurs within the same BFC, elements from different BFCs will not merge their margins. Clear the height collapse caused by floating. When a child element floats, the parent element may collapse due to the inability to calculate the height of the floating element. The rules of BFC require its height to include the bottom edge of the internal floating element, so triggering the BFC of the parent element can solve this problem. For example, after setting overflow: hidden for the parent container, its height will expand to include all floating child elements. Principle: The height calculation of BFC includes the lower edge of the floating element, rather than relying on sub elements to "report" the height. Avoid floating elements and text wrapping. Floating elements inside BFC will not wrap around external text or other elements, but will be arranged independently. For example, if there is a floating image next to a paragraph, wrapping the paragraph in BFC can prevent text from surrounding the image. Layout isolation in practical application scenarios: Using BFC to divide complex layouts into independent areas, reducing style conflicts. Adaptive two column layout: floating on the left and automatically filling the remaining space on the right by triggering BFC. Prevent elements from being covered by floating: Elements within BFC will maintain boundaries with floating elements to avoid overlap. Summary: BFC is the core mechanism for implementing layout isolation and control in CSS, which generates independent rendering areas by triggering conditions to solve common problems such as margin overlap and floating collapse. Understanding its triggering conditions and functional rules enables more efficient writing of robust layout code.

2. Comprehensive usage tips for CSS flex flow properties

flex flow is a composite property in CSS Flexbox that sets both flex

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