Keywords: WPF, button, label, text, bold, font weight, fontweight, by default
.Netframework 4.5
Copy following codes and check the difference between applying any style and not applying:
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<Window x:Class="MvvmWpfApp.Views.TestUI"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="TestUI" Height="328" Width="412">
<Grid>
<StackPanel Margin="20">
<Button HorizontalAlignment="Left">
<Button.Style>
<Style TargetType="Button" />
</Button.Style>
Normal Text
</Button>
<Button HorizontalAlignment="Left">
Bold Text
</Button>
</StackPanel>
</Grid>
</Window>