Final answer:
A media query condition of min-width: 300 means that the CSS rules inside it will only be applied to devices with a minimum width of 300 pixels.
Step-by-step explanation:
The media query condition min-width: 300 in web design is used to specify a CSS rule that will be applied to a device or viewport with a minimum width of 300 pixels (px). This means that the CSS rules inside this media query will only take effect when the screen or viewport width is equal to or greater than 300px.
For example, if you have a media query with the condition min-width: 300px and you set the background color of an element to red, that background color will only be visible on devices with a screen width of 300px or greater. On devices with a smaller screen width, a different CSS rule or default styles will be applied.