How to Seamlessly Integrate a Button into an Input Field with Modern CSS?

How to Integrate a Button into an Input Using Modern CSS

Problem:
Create a visual element where a button is seamlessly integrated within an input field, allowing for normal user interaction, preserving text visibility, and maintaining accessibility and screen-reader compatibility.

Solution: Flexbox and Form Border

The optimal approach involves using a flexbox layout along with a border on the containing element (form):

1. Positioning: Set up a flexbox with a horizontal row layout, allowing the input to expand to fill available space.
2. Input Concealment: Eliminate the input's border to effectively hide it, making it appear merged with the form's border.
3. Form Focus: Create a focus effect on the form itself, visually encompassing both the input and button.
4. Element Styling: Apply styles to the button for presentation, such as border, background, and color.

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